1. Division of Respiratory Medicine and Allergology, Department of Medicine, Teikyo University School of Medicine, Tokyo, Japan.
2. Division of Respiratory Medicine, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan.
3. Division of Respiratory Medicine and Allergology, Department of Medicine, Showa University School of Medicine, Tokyo, Japan.
4. Division of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo, Japan.
5. Akihabara Atsuta Clinic, Tokyo, Japan.
6. Department of Respiratory Medicine, Tokyo Women's Medical University, Tokyo, Japan.
7. Department of Respiratory Medicine, National Center for Global Health and Medicine, Tokyo, Japan.