Original Research

Severe COPD cases from Korea, Poland, and USA have substantial differences in respiratory symptoms and other respiratory illnesses

Kim WJ, Yim J, Kim DK, Lee MG, Fuhlbrigge AL, Sliwinski P, Hawrylkiewicz I, Wan ES, Cho MH, Silverman EK

International Journal of Chronic Obstructive Pulmonary Disease 2017, 12:3415-3423

Published Date: 30 November 2017