1. Division of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo 190‑8531, Japan
2. Division of Pulmonary Medicine, Department of Internal Medicine, Federation of National Public Service Personnel Mutual Aid Associations, Tachikawa Hospital, Tokyo 190‑8531, Japan
3. Department of Neuropsychiatry, Federation of National Public Service Personnel Mutual Aid Associations, Tachikawa Hospital, Tokyo 190‑8531, Japan
4. Department of Surgery, Federation of National Public Service Personnel Mutual Aid Associations, Tachikawa Hospital, Tokyo 190‑8531, Japan