Usage patterns of stop smoking medications in Australia, Canada, the United Kingdom, and the United States: findings from the 2006-2008 International Tobacco Control (ITC) Four Country Survey.
Fix BV, Hyland A, Rivard C, McNeill A, Fong GT, Borland R, Hammond D, Cummings KM. Int J Environ Res Public Health. 2011 Jan; 8(1):222-33. Epub 2011 Jan 20.