Affiliation: | (1) Department of Pulmonary Medicine, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan;(2) Department of Respiratory Medicine, Yokohama Municipal Citizen's Hospital, 56 Okazawa-cho. Hodogaya-ku, Yokohama Kanagawa, 240-8555, Japan |