1. Department of Medicine, Division of Respiratory Medicine and Allergology, Showa University School of Medicine, Tokyo, Japan
2. Department of Medicine, Division of Respiratory Medicine, Yamanashi Red Cross Hospital, Yamanashi, Japan
3. Department of Medicine, Division of Respiratory Medicine, Kokuho Asahi Chuo Hospital, Chiba, Japan
4. Department of Medicine, Division of Respiratory Medicine, Tokyo Metropolitan Health and Hospitals Corporation Ebara Hospital, Tokyo, Japan
5. Department of Medicine, Division of Respiratory Medicine, Odawara Municipal Hospital, Odawara, Kanagawa, Japan
6. Department of Medicine, Division of Respiratory Medicine, Showa University Fujigaoka Hospital, Kanagawa, Japan