1. The First Department of Internal Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu, Japan;
2. The Department of Pathology and Oncology, University of Occupational and Environmental Health, Japan, Kitakyushu, Japan;
3. The Department of Pathology, University of Occupational and Environmental Health, Japan, Kitakyushu, Japan;
4. Department of Diagnostic Pathology, Saitama Medical University International Medical Center, Saitama, Japan;
5. Third Department of Internal Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu, Japan;
6. Department of Respiratory Medicine, School of Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu, Japan