Implementation of key demand-reduction measures of the WHO Framework Convention on Tobacco Control and change in smoking prevalence in 126 countries: an association study oleh Shannon Gravely, PhD, Gary A Giovino, PhD, Lorraine Craig, MHSc, Alison Commar, MA, Edouard Tursan D'Espaignet, PhD, Kerstin Schotte, MD, Geoffrey T Fong, ProfPhD