The Burden of Illness Related to Chronic Obstructive Pulmonary Disease Exacerbations in Québec, Canada oleh Tam Dang-Tan, Shiyuan Zhang, Ruben V. Tavares, Melissa Stutz, Afisi S. Ismaila, Julie Vaillancourt, Diane Corriveau, Richard H. Stanford, Xiwu Lin, Gilbert A. Nadeau, Alexander Simidchiev, Daria Parsons, John S. Sampalis