1. The Second Department of Internal Medicine, Nagasaki University School of Medicine, Japan
2. Tissue and Histopathology Section, Division of Scientific Date Registry, Atomic Bomb Disease Institute, Nagasaki University Graduate School of Biomedical Sciences, Japan
3. Department of Respiratory Medicine, University of Occupational and Environmental Health, Japan
4. Department of Pathology, Saitama Cardiovascular and Respiratory Center, Japan