1. 1Second Department of Internal Medicine, Nagasaki University School of Medicine, Nagasaki, Japan
2. 2Second Department of Internal Medicine, Nagasaki University School of Medicine, Nagasaki, Japan; and Department of Respiratory Diseases, School of Medicine, University of Occupational and Environmental Health, Fukuoka, Japan
3. 3Department of Pathology, Nagasaki University Hospital, Nagasaki, Japan