1. Cahill K, Moher M, Lancaster T: Workplace interventions for smoking cessation. Cochrane Database Syst Rev. 2008, 4: CD003440-doi:10.1002/14651858.CD003440.pub3
2. National Institute for Health and Clinical Excellence: Workplace health promotion: how to help employees to stop smoking. 2007, http://www.nice.org.uk/nicemedia/pdf/PHI005guidance.pdf ,
3. Fichtenberg C, Glant S: Effect of smoke-free workplaces on smoking behaviour: systematic review. Br Med J. 2002, 325: 188-194. 10.1136/bmj.325.7357.188.
4. York Health Economics Consortium: A rapid review of the costeffectiveness of workplace policies for smoking cessation in England. 2006, http://www.nice.nhs.uk/nicemedia/pdf/SmokingCessationEconomicsNon-NHSFullReview.pdf ,
5. Dixon-Woods M, Fitzpatrick R: Qualitative research in systematic reviews has established a place for itself. Br Med J. 2001, 323: 765-766. 10.1136/bmj.323.7316.765.