Tobacco use in 3 billion individuals from 16 countries: an analysis of nationally representative cross-sectional household surveys. - Giovino, Gary A.; Mirza, Sara A.; Samet, Jonathan M.; Gupta, Prakash C.; Jarvis, Martin J.; Bhala, Neeraj; Peto, Richard; Zatonski, Witold; Hsia, Jason; Morton, Jeremy; Palipudi, Krishna M.; Asma, Samira (Lancet, 2012)