[1] Keio Univ, Sch Med, Dept Med, Div Pulm Med, Tokyo, Japan
[2] Keio Univ, Sch Med, Dept Hlth Policy & Management, Tokyo, Japan
[3] Hino Manicipal Hosp, Dept Med, Tokyo, Japan
[4] Keiyu Hosp, Dept Med, Yokohama, Kanagawa, Japan
[5] Tachikawa Hosp, Dept Med, Tokyo, Japan