1. Department of Internal Medicine, Division of Hematology, Rheumatology and Respiratory Medicine, Faculty of Medicine, Kagawa University, Miki-cho, Kagawa 761‑0793, Japan
2. Department of Respiratory Medicine, Kagawa Prefectural Central Hospital, Takamatsu, Kagawa 760‑8557, Japan
3. Department of Internal Medicine, Federation of National Public Service Personnel Mutual Aid Associations Takamatsu Hospital, Takamatsu, Kagawa 760‑0018, Japan
4. Department of Pulmonary Medicine, Takamatsu Municipal Hospital, Takamatsu, Kagawa 761‑8538, Japan