Comparison between objective measures of smoking and self-reported smoking status in patients with asthma or COPD: are our patients telling us the truth?
Rafael Stelmach, Frederico Leon Arrabal Fernandes, Regina Maria Carvalho-Pinto, Rodrigo Abensur Athanazio, Samia Zahi Rached, Gustavo Faibischew Prado, Alberto Cukier