Bronchodilator responsiveness and reported respiratory symptoms in an adult population.
Tan WC, Bourbeau J, Hernandez P, Chapman KR, Cowie R, FitzGerald JM, Aaron S, Marciniuk DD, Maltais F, Buist AS, et al. PLoS One. 2013; 8(3):e58932. Epub 2013 Mar 15.