1. 1. World Health Organization. WHO report on the global tobacco epidemic 2017. Available at: http://www.who.int/tobacco/global_report/en/. Accessed November 15, 2017.
2. 2. Epidemiology and Disease Control Division, Ministry of Health, Singapore. National Health Survey 2010. Available at: https://www.moh.gov.sg/content/dam/moh_web/Publications/Reports/2011/NHS2010%20-%20low%20res.pdf.Accessed November 15, 2017.
3. 3. Epidemiology and Disease Control Division, Ministry of Health, Singapore. National Health Survey 2004. Available at: https://www.moh.gov.sg/content/dam/moh_web/Publications/Reports/2005/1/NHS_2004(Part4).pdf. Accessed November 15, 2017.
4. Smoking cessation and mortality among middle-aged and elderly Chinese in Singapore: the Singapore Chinese Health Study;Lim;Tob Control,2013
5. Smoking cessation intervention for hospitalized smokers: a systematic review;Rigotti;Arch Intern Med,2008