1. Department of Respiratory Medicine, Nagasaki University Hospital, Nagasaki, Japan
2. Department of Respiratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
3. Department of Respiratory Medicine, Isahaya General Hospital, Japan Community Health Care Organization, Isahaya, Japan
4. Division of Respiratory Medicine, Department of Internal Medicine, Toho University Ohashi Medical Center, Tokyo, Japan