• Users Online: 5980
  • Home
  • Print this page
  • Email this page
Home About us Editorial board Ahead of print Current issue Search Archives Submit article Instructions Subscribe Contacts Login 

 Table of Contents  
Year : 2017  |  Volume : 2  |  Issue : 3  |  Page : 69-77

Do exceptions to smokefree environment work? A case study of designated smoking rooms in Indian civil airports

1 Department of Tobacco Control and NCD, International Union against Tuberculosis and Lung Disease, New Delhi, India
2 Independent Public Health Consultant, New Delhi, India
3 Department of Community Medicine, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India
4 Department of Community Medicine, Sri Manakula Vinayagar Medical College and Hospital, Puducherry, India

Date of Web Publication17-Oct-2017

Correspondence Address:
Ashish Kumar Pandey
C-6, Qutub Institutional Area, New Delhi - 110 016
Login to access the Email id

Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jncd.jncd_26_17

Rights and Permissions

Background: According to the WHO, 603,000 people die annually from secondhand smoke(SHS) exposure, of which nearly 200,000 is in Southeast Asia. India's national tobacco control legislation provides an exception to create designated smoking rooms(DSRs) in certain hospitality sector and airport.
Objective: To assess the compliance of DSRs in India's civil airports to national tobacco control legislation and explore the perspectives of key stakeholders regarding its purpose and usefulness.
Methodology: A mixed-method study(triangulation design) where both quantitative(structured survey) and qualitative(key informant interviews) methods were used to measure the compliance level of DSRs and to explore the stakeholder's perceptions on DSRs, respectively.
Results and Conclusions: Our survey found that all DSRs met with the legislative requirements as specified under the Smokefree Rules. However, nine of the 15 DSRs surveyed were found to be ineffective as they spread SHS in adjacent no smoking areas. Contrary to the prevailing belief that smokers feel an irresistible urge to smoke, our interview results suggest that such urge was entirely manageable even for longer durations. Respondents(smokers) also shared that some DSRs because of poor design and lack of proper ventilation were suffocating and therefore were not a desirable place for smoking. In addition, half of the DSRs violated the tobacco advertising provision. The existing rationale of providing a dedicated space(DSRs) given the operational and public health concerns is questionable. The survey findings calls for elimination of the exceptions provided to smokers in the form of DSRs in public places such as airports.

Keywords: Designated Smoking Rooms, Legislation, Secondhand Smoke, Smokefree, Tobacco Control

How to cite this article:
Pandey AK, Jacob AG, Palanivel C, Dongre A, Singh RJ, Lal P. Do exceptions to smokefree environment work? A case study of designated smoking rooms in Indian civil airports. Int J Non-Commun Dis 2017;2:69-77

How to cite this URL:
Pandey AK, Jacob AG, Palanivel C, Dongre A, Singh RJ, Lal P. Do exceptions to smokefree environment work? A case study of designated smoking rooms in Indian civil airports. Int J Non-Commun Dis [serial online] 2017 [cited 2023 Jan 27];2:69-77. Available from: https://www.ijncd.org/text.asp?2017/2/3/69/216877

  Introduction Top

Exposure to secondhand smoke(SHS) has been irrevocably linked to a range of diseases in comprehensive scientific summaries, whether it originates from the burning of tobacco products directly(such as cigarettes or cigars) or is exhaled or breathed out by a smoker.[1],[2],[3] In effect, there is no safe level of exposure to SHS. WHO's Framework Convention on Tobacco Control(FCTC) states that “scientific evidence has unequivocally established that exposure to tobacco smoke causes death, disease, and disability”.[4] Globally, SHS exposure accounts for 603,000 deaths per year, of which 200,000 occur in South Asia.[5],[6] A systematic review found that the “effectiveness of legislative efforts will also depend on successful enforcement of smoking bans and compliance with the legislation.”[7]

In India, 275 million adults use tobacco in various forms; of these, nearly 111 million adults are smokers, which effectively exposes 684 million adult nonsmokers to SHS.[8] India's tobacco control legislation(Cigarettes and Other Tobacco Products[Prohibition of Advertisement and Regulation of Trade and Commerce, Production, Supply and Distribution] Act of 2003[COTPA]) bans smoking in public places with exceptions for hotels, restaurants, and airports which may have Designated Smoking Rooms(DSRs), under conditions and specifications mandated under the Smokefree Rules, 2008 of COTPA.[9],[10] Subsequent regulations further restrict tobacco product promotions and advertisements and sales to minors at points of sale and through a comprehensive ban on vending machines.[11],[12],[13]

Since 2008, subnational surveys have confirmed that various public places in 38 jurisdictions have failed to comply with smokefree regulations.[14] However, to the best of our knowledge, no study has examined the compliance of DSRs at civil airport in India. Nearly 190 million passengers use airports in the year 2014–2015 to travel across the country, and among the world's largest domestic markets, India had the fastest annual growth of 18.8% in 2015.[15],[16] Therefore, assessing the degree and quality of compliance is a matter of considerable public health importance. We aimed to assess the compliance of the rules specified for DSRs at civil airports in India. The aim of this study is to determine whether DSRs have been designated and maintained as per specifications prescribed under COTPA and to understand the perspectives of various stakeholders regarding the SHS, DSR, and the provisions that regulate it.

  Methodology Top

Study design and study population

We used a mixed-method triangulation design study involving quantitative(observational survey) and qualitative(key informant interviews) components,[17] conducted between May 2015 and June 2016.

Indian civil airports constituted the study units for the quantitative survey and key constituent stakeholder groups(medical experts, smokers, tobacco control law enforcement officials, and tobacco control advocates) constituted study population for the qualitative part.

Study setting

The Parliament of India enacted COTPA in May 2003, and India ratified the FCTC in February 2004, expressing its commitment to protect public health from the menace of tobacco. Several reasons such as limited political will, complex administrative processes, litigation by the tobacco industry among others delayed the notification and subsequent enforcement of COTPA. With the efforts of civil society groups and directions from the Supreme Court of India, the Smokefree Rules came into force in May 2008 and were implemented in earnest by states from October 2008.

Aligning with the spirit of COTPA to protect nonsmokers from exposure to SHS, the rules have stringent specifications including prohibiting DSRs from being located at the entrance or exit and requirements to display clear signage. The Rules of 2008 specify that DSRs must be enclosed in a full height wall with automatic closing door, with a separate nonrecirculating air ventilation system. It also requires maintaining negative air pressure in DSRs to prevent outflow of tobacco smoke into other enclosed spaces. To discourage smokers from spending time in DSRs, no services to the smoker are allowed inside DSRs. Subsequently, provisions in COTPA prohibit the sale of tobacco products to minors(those under the age of 18years) and require tobacco vendors to display a signage at the point-of-sale. Complete bans are enforced on any direct or indirect advertisement, promotion and sponsorship of tobacco products. After the Smokefree Rules of 2008 came into force, many airports in India added DSRs.

Of the 15 Indian civil airports surveyed in the study, half of the airports(n=8) served domestic flights within India; seven airports served both international and domestic flights.

Sample size and sampling technique

For the quantitative part of the study, 15 Indian civil airports which serve the majority of its air passengers were purposively selected based on traffic volume, number of daily flights, convenience, and geographic representativeness. The following airports were included in the study: Bengaluru, Bhopal, Chandigarh, Chennai, Delhi, Hyderabad, Jaipur, Jammu, Kolkata, Lucknow, Mumbai, Patna, Raipur, Srinagar, and Varanasi.

For the qualitative part of the study, three individuals from each stakeholder group were purposively selected for interviews in discussion with members of Tobacco Control Unit of The Union Southeast Asia Office.

Data variables, tools, and data collection

A checklist was developed to measure the compliance of DSRs with COTPA. Relevant provisions of the Rules were carefully converted into unique variables. The checklist broadly included aspects related to the build and maintenance of DSRs, smoke-free regulations, display of signage, tobacco sales, and advertisements near DSRs. Data were collected by the principal investigator(PI) and tobacco control partners from states who are familiar with COTPA. The survey team was briefed and oriented by the PI on the objectives, methods, and data collection and recording. The checklist was completed within 7–10min by these expert observers while travelling through the 15 airports.

Personal interviews(face-to-face or telephonic) with selected individuals from all the four stakeholder groups were conducted at a time convenient to the key informant by the PI who was formally trained in qualitative research methods. Ten participants were interviewed with each ranging from 10 to 15min. All key informants consented to being audio recorded(except one law enforcer who agreed to being interviewed without any audio recording whatsoever). The interviews were based on a topic guide including structured, open-ended questions to elicit the widest range of perceptions from interviewees on DSRs. The interview guide was prepared in consultation with the coauthors. Field notes were taken during interviews. Written informed consent(directly signed in the presence of the PI or provided as a signed scanned copy via e-mail if done telephonically) was obtained from all the study participants who were part of qualitative phase of this study.

Data entry and data analysis

Quantitative data were entered and validated through double-entry using EpiData Entry software (version3.1) and analysis was done using EpiData analysis (version2.2.2.182) the EpiData Association, Denmark in 1999. Compliance with each of the provisions of COTPA was expressed as proportion.

Transcripts were prepared by the PI using the audio recording and field notes within 2days to ensure the completeness and accuracy of information. Descriptive content analysis to derive the common themes was done jointly by the first two authors through manual coding.[17] The findings were reviewed by the two coauthors to reduce bias and interpretative credibility. Any ambiguities or disagreements were resolved through discussion.

Institutional Ethics Committee approval

The study protocol was approved by the Ethics Advisory Group of the International Union Against Tuberculosis and Lung Disease, Paris, France.

  Results Top

Of 15 DSRs studied, except one airport, COTPA specifications for the location, and design specifications of DSRs were largely met. Only one DSR(Bengaluru) was located very close to the exit or entrance of the airport surveyed. Of the 15 DSRs surveyed, the smell of tobacco smoke was perceptible in nine DSRs(60%). This was mainly observed in departure(67%, n=8) rather than arrival terminals[Table1]. All 15 DSRs complied with the law regarding display of clear signage which identified their presence and prohibitions on services within the DSR[Table1].
Table 1: Compliance of designated smoking areas with the smoke-free rules of Indian tobacco control law, i.e., Cigarette and Other Tobacco Products (Prohibition of Advertisement and Regulation of Trade and Commerce, Production, Supply and Distribution) Act, 2003 in the 21 terminals of surveyed civil airports in India, 2015-2016

Click here to view

The Smokefree Rules notified in 2008(which allowed DSRs as an exception) require that public places be protected from SHS[Box 1 [Additional file 1]]. This was largely observed in all the airports[Table2]. In the 21 terminals of 15 airports surveyed, only two terminals did not prominently display any “no smoking” signage whatsoever; of the remaining 19 terminals with the signage, 17 had appropriate “no smoking” signs at conspicuous places as per the dimensions and design mandated under the Smokefree Rules. Cigarette butts were found in two places(Delhi and Varanasi), suggesting that smokers violate these rules) in the no smoking area. Active smoking was also observed at one site(Delhi). In 17 terminals(80%), information regarding the contact details of the official-in-charge with whom complaints could be lodged in the event of violations were not displayed[Table2].
Table 2: Compliance with Indian tobacco control law, i.e., Cigarette and Other Tobacco Products (Prohibition of Advertisement and Regulation of Trade and Commerce, Production, Supply, and Distribution) Act, 2003 in the 21 terminals of surveyed civil airports in India, 2015-2016

Click here to view

For the qualitative data, inductive manual content analysis of the responses suggested 10 broad categories. Further, of these 10 categories, three themes clearly emerged: perceptions on smoking and its effects; knowledge and perceptions about DSRs; and perceptions about exceptional to the law and other pertinent issues. Some respondents suggested improving the availability of low-cost nicotine replacement therapies for smokers to abstain from smoking whilst using airports. These themes are summarized in [Table3].
Table 3: Global thematic analysis of key categories emerging from semi-structured qualitative interviews with smokers, medical experts, tobacco law enforcement officials and tobacco control advocates (2016)

Click here to view

  Discussion Top

By permitting DSRs, COTPA provides an exception for smoking in a public place, albeit by isolating smokers from exposing nonsmokers. While most DSRs surveyed were compliant to the specifications of the Smokefree Rules, leakages of SHS were noted by observers in 60% of the airports, thereby defeating the very purpose for which DSRs were set up. Contrary to the spirit of the law, the tobacco industry displays its products at points-of-sale and advertises logos, colors, and designs in the interiors of DSRs, thereby violating provisions of COTPA[Box 2 [Additional file 2]].

Respondents including smokers not only conceded that the urge to smoke could be managed for short duration flights within India but also agreed that they could be controlled for longer duration flights using nicotine supplements. In addition, smokers criticized the functional design of DSRs and shared that they felt suffocated while smoking there. As a consequence, many kept the doors of DSRs open or stood near the door while smoking. With a few exceptions, most respondents were aware of the dangers of smoking. No tobacco control advocate supported the presence of DSRs at airports whereas medical experts expressed the need of DSRs to protect nonsmokers from SHS. The only tobacco control law enforcement official interviewed supported DSRs mainly to avoid the increase of violations of Smokefree Rules on the part of smokers since the fine was not high enough to deter them from smoking in public places. Others recommended the importance of information, education, and communication(IEC) strategies. As a group, medical experts and tobacco control advocates highlighted the need to strategically use IEC methods at DSRs for greater effect.

How these findings compare with previous studies

This is possibly the first mixed-methods design study systematically examining the observed implementation of COTPA legislation in India's major airports and the potential exposure of 190 million passengers to SHS by the legal provision for DSRs prescribed under Indian law.[15] In our literature survey, we found policy reviews and scientific studies, but no study comprehensively surveyed DSRs and taken the opinion of various stakeholders for creating DSRs.

Globally, policy reviews encourage the need to widen and deepen smokefree airport policies. In 2004, the US Centers for Disease Control and Prevention advocated the increased enforcement of smokefree policies in US airports to protect both workers in airports and air passengers.[18] A survey of US flight attendants confirmed that they were “still being exposed to SHS…sometimes at concerning levels during the nonflight portions of their travel.”[19] A global review of policies in 34 major international airports noted that SHS could be more strictly regulated in public and occupational spaces,[20] but the enforcement of rules related to DSRs was often overlooked given the legal and policy ambiguity in national and subnational legislation.

Scientific studies have largely been done in developed country settings(USA, SouthKorea, and EU), except a study examining the air quality of airports in Thailand.[21],[22],[23] A 2004 study in the US documented the advocacy of tobacco industry lobbying for DSRs as a measure to weaken efforts to make major US airports smoke-free. Scientific monitoring of the air quality around DSR had established that smoking rooms at airports “expose(d) nonsmokers in adjacent nonsmoking areas to a significant concentration of nicotine vapor from SHS.”[21] A 2015 study from Thailand validated that “levels of PM2.5 in DSRs were extremely high in all four Thai airports and were more dangerous inside DSRs than in US airports”.[23] This same study elicited the views of tourists regarding their perceptions and support regarding smoke-free policies in Thailand; though half of the respondents were smokers, the support for a complete smokefree policy was very strong across respondents. Partial smoking bans clearly do not protect nonsmokers. A2009 study in SouthKorean airports concluded that despite the functional ventilation systems installed in smoking rooms, fine particles from SHS leaked into surrounding “no smoking area” areas and recommended that indoor space inside airports should be completely nonsmoking.[24]

Strengths and limitations of the study

A key strength of this study is the use of a mixed-methods design. Within this study, we measured legislative compliance to DSRs and other tobacco control provisions along with a representative exploration of the views and opinions of diverse stakeholders who have a significant interest in DSRs.

A second strength is an objectivity of assessing compliance. Since the observers were sensitized, the mixed-method study design allows us to conduct research with relatively low costs of the training and deployment. Regardless of the constituency interviewed, our interviews were unexpectedly similar in the levels of overlap in the opinions expressed[Table3]. We believed that we have reached data saturation. The STROBE and COREQ guidelines were followed for reporting quantitative and qualitative components, respectively.[25],[26]

One limitation of this study is the under-representation of those involvements in the enforcement of tobacco control rules. This is largely because enforcers considered for this study were those officials limited to the airport alone and not those in-charges of the administrative jurisdiction(since the latter have limited access within airports). The opinions of enforcer under whom DSRs operate, is limited to one individual, which could have been due to reasons not related to the research topic but due to factors beyond their control. Another limitation of this study is that we were unable to measure the SHS levels in nonsmoking areas of the airport.


Our survey finds that DSRs currently have mixed levels of support from various constituencies. Our findings–from compliance measures and interviews–confirm that DSRs fail to protect nonsmokers. This is largely because DSRs' infrastructure(including exhaust system and automating closing door) are faulty, and the design of DSRs has to be reevaluated for their effectiveness. Authorities need to check for violations regularly, for smoking-related issues and tobacco advertisements at points-of-sale and indirect advertising within DSRs. Given the behavioral evidence reported in this study, nicotine replacement therapies be made available at airports to counter the urge to smoke at airports. This study needs to be further validated through scientific measurement and validation for the particulate matter(PM2.5) and SHS outside DSRs. This would in our view provide indisputable support for rolling out fully compliant smoke-free policies in Indian airports given the interests of over190 million travelers who fly annually, as well as the imperative to protect future generations from SHS.

In addition, DSR diverts public space and public money to support a deadly habit. This in effect encourage smokers while harming the larger interest of the public.

  Conclusions Top

This study has raised questions about the existence of DSRs due to its ineffectiveness in confining SHS and also its de facto use to promote tobacco brands. Our results confirm that DRSs fail to protect due to low levels of compliance with design specifications. Regular monitoring and oversight of the implementation of existing COTPA provisions cannot be overemphasized. Stakeholders(including smokers) have reiterated that tobacco addiction is manageable and that the health of nonsmokers should be the priority and must be protected. Keeping this in view, a policy revision is needed which eliminates DSRs.


This research was conducted through the Structured Operational Research and Training Initiative(SORT IT), a global partnership led by the Special Programme for Research and Training in Tropical Diseases at the World Health Organization(WHO/TDR). The model is based on a course developed jointly by the International Union Against Tuberculosis and Lung Disease(The Union) and Medécins sans Frontières(MSF/Doctors Without Borders). The specific SORT IT programme which resulted in this publication was jointly developed and implemented by: The Union South-East Asia Office, NewDelhi, India; the Centre for Operational Research, The Union, Paris, France; the Operational Research Unit(LUXOR), MSF Brussels Operational Center, Luxembourg; Department of Preventive and Social Medicine, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India; Department of Community Medicine, Sri Manakula Vinayagar Medical College and Hospital, Puducherry, India; Department of Preventive and Social Medicine, Medical College Baroda, Vadodara, India; and National Institute for Research in Tuberculosis, Chennai, India.

We also acknowledge the voluntary support extended by tobacco control partners from states to conduct the observational part of the study in some of the airport.

Financial support and sponsorship

The study was conducted with the support from the colleagues in The Union and tobacco control partners in the states. It had no financial prerequisite or implication. The study was done a part of the training program funded by the Department for International Development(DFID), UK, The Union, MSF, and La Fondation Veuve Emile Metz-Tesch(Luxembourg).

Conflicts of interest

There are no conflicts of interest.

  References Top

Office on Smoking and Health. The Health Consequences of Involuntary Exposure to Tobacco Smoke. Centers for Disease Control and Prevention(US); 2006. Available from: http://www.ncbi.nlm.nih.gov/books/NBK44324/.[Last accessed on 2015Oct05].  Back to cited text no. 1
World Health Organization. International Consultation on Environmental Tobacco Smoke(ETS) and Child Health; 1999.  Back to cited text no. 2
IARC Working Group on the Evaluation of Carcinogenic Risks to Humans. Tobacco smoke and involuntary smoking. IARC Monogr Eval Carcinog Risks Hum 2004;83:1-438.  Back to cited text no. 3
World Health Organization. Framework Convention on Tobacco Control; 2004.  Back to cited text no. 4
ObergM, JaakkolaMS, WoodwardA, PerugaA, Prüss-Ustün A. Worldwide burden of disease from exposure to second-hand smoke: Aretrospective analysis of data from 192 countries. Lancet 2011;377:139-46.  Back to cited text no. 5
SinghRJ, LalPG. Second-hand smoke: Aneglected public health challenge. Indian J Public Health 2011;55:192-8.  Back to cited text no. 6
[PUBMED]  [Full text]  
FrazerK, CallinanJE, McHughJ, van BaarselS, ClarkeA, DohertyK, etal. Legislative smoking bans for reducing harms from secondhand smoke exposure, smoking prevalence and tobacco consumption. In: FrazerK, editor. Cochrane Database of Systematic Reviews. Chichester, UK: John Wiley & Sons, Ltd.; 2016. Available from: http://www.doi.wiley.com/10.1002/14651858.CD005992.pub3.[Last accessed on 2016Jul05].  Back to cited text no. 7
International Institute for Population Sciences(IIPS) Ministry of Health and Family Welfare Government of India. Global Adult Tobacco Survey India Report(GATS); 2009-2010.  Back to cited text no. 8
Government of India. Cigarettes and Other Tobacco Products(Prohibition of Advertisement and Regulation of Trade and Commerce, Production, Supply and Distribution) Act 2003. India; 2003. p.10.  Back to cited text no. 9
Ministry of Health and Family Welfare Government of India. NotificationG.S.R. 417(E); 30May, 2008.  Back to cited text no. 10
Ministry of Health and Family Welfare Government of India. NotificationG.S.R. 656(E); 20October, 2006.  Back to cited text no. 11
Ministry of Health and Family Welfare Government of India. NotificationG.S.R. 345(E); 31May, 2005.  Back to cited text no. 12
Ministry of Health and Family Welfare Government of India. NotificationG.S.R. 137; 25February, 2004.  Back to cited text no. 13
KumarR, GoelS, HarriesAD, LalP, SinghRJ, KumarAM, etal. How good is compliance with smoke-free legislation in India? Results of 38 subnational surveys. Int Health 2014;6:189-95.  Back to cited text no. 14
Mnistry of Civil Aviation–Government of India. Director General of Civil Aviation(DGCA) Annual Report, 2014-15.  Back to cited text no. 15
The International Air Transport Association(IATA). India Sees Highest Domestic Market Growth in 2015. 60thedition of IATA World Air Transport Statistics; 2016. Available from: http://www.iata.org/pressroom/pr/Pages/2016-07-05-01.aspx.[Last accessed on 2016Jul11].  Back to cited text no. 16
CreswellJW, ClarkVL. Designing and Conducting Mixed Methods Research. 2nded. NewDelhi: Sage Publications; 2011. p.63.  Back to cited text no. 17
Centers for Disease Control and Prevention(CDC). Survey of airport smoking policies–United States, 2002. MMWR Morb Mortal Wkly Rep 2004;53:1175-8.  Back to cited text no. 18
StillmanFA, SoongA, ZhengLY, Navas-AcienA. Clear skies and grey areas: Flight attendants' secondhand smoke exposure and attitudes toward smoke-free policy 25years since smoking was banned on airplanes. Int J Environ Res Public Health 2015;12:6378-87.  Back to cited text no. 19
StillmanFA, SoongA, KlebC, GrantA, Navas-AcienA. Areview of smoking policies in airports around the world. Tob Control 2015;24:528-31.  Back to cited text no. 20
PionM, GivelMS. Airport smoking rooms don't work. Tob Control 2004;13Suppl1:i37-40.  Back to cited text no. 21
SirichotiratanaN, YogiS, PrutipinyoC. Perception of tourists regarding the smoke-free policy at suvarnabhumi international airport, Bangkok, Thailand. Int J Environ Res Public Health 2013;10:4012-26.  Back to cited text no. 22
KungskulnitiN, CharoencaN, PeesingJ, TrangwatanaS, HamannS, PitayarangsaritS, etal. Assessment of secondhand smoke in international airports in Thailand, 2013. Tob Control 2015;24:532-5.  Back to cited text no. 23
LeeK, HahnEJ, RobertsonHE, WhittenL, JonesLK, ZahnB, etal. Air quality in and around airport enclosed smoking rooms. Nicotine Tob Res 2010;12:665-8.  Back to cited text no. 24
von ElmE, AltmanDG, EggerM, PocockSJ, Gøtzsche PC, VandenbrouckeJP, etal. The strengthening the reporting of observational studies in epidemiology(STROBE) statement: Guidelines for reporting observational studies. JClin Epidemiol 2008;61:344-9.  Back to cited text no. 25
TongA, SainsburyP, CraigJ. Consolidated criteria for reporting qualitative research(COREQ): A32-item checklist for interviews and focus groups. Int J Qual Health Care 2007;19:349-57.  Back to cited text no. 26


  [Table1], [Table2], [Table3]


Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
Access Statistics
Email Alert *
Add to My List *
* Registration required (free)

  In this article
   Article Tables

 Article Access Statistics
    PDF Downloaded91    
    Comments [Add]    

Recommend this journal