[1] Tosei Gen Hosp, Seto, Aichi, Japan
[2] Beijing Union Med Coll Hosp, Beijing, Peoples R China
[3] Nippon Med Sch, Tokyo 113, Japan
[4] Natl Hosp Org, Kinki Chuo Chest Med Ctr, Osaka, Japan
[5] Shanghai Pulm Hosp, Shanghai, Peoples R China
[6] Nippon Boehringer Ingelheim Co Ltd, Tokyo, Japan
[7] Boehringer Ingelheim Ltd, Bracknell, Berks, England
[8] Boehringer Ingelheim Pharmaceut Inc, Ridgefield, CT 06877 USA
[9] Univ Ulsan, Asan Med Ctr, Seoul, South Korea