Epidemiology of Chronic Obstructive Pulmonary Disease
Kye Young Lee, M.D.
Department of Internal Medicine, Dankook University Medical Center, Korea.
Address for correspondence: Kye Young Lee, M.D. Department of Internal Medicine, Dankook University Medical Center 16-5 Anseo-dong Cheonan, Republic of Korea. Phone: 041-550-3916, Fax: 041-556-3256, kyleemd@dankook.ac.kr