Comparison of Tiotropium and Ipratropium in a Double-Blind, Double-dummy, Efficacy and Safety Study in Adults With COPD

Chungnam National University Hospital, Daejeon

Jeonbuk National University Hospital, Jeonju

Jeonnam National University Hospital, Kwangju

Pusan University Hospital, Pusan

Chung-ang University Hospital, Seoul

Hanyang University Hosital, Seoul

Kangnam St. Mary's Hospital, Seoul

Korea University Hospital, Seoul

Kyoungbuk National University Hospital, Seoul

Kyunghee University Hospital, Seoul

National Medical Center, Seoul

Samsung Seoul Hospital, Seoul

Seoul Asan Hospital, Seoul

Seoul National University Hospital, Seoul

Shinchon Severence Hosp (Yonsei University Hosp), Seoul

St. Paul's Hospital, Dept. of Respiratory, Seoul

Youngdong Sevarence Hospital (Yonsei University Hospital), Seoul

Wonju Christian Hospital (Yonsei University Hosp), Wŏnju