1. Department of Respiratory Medicine, School of Medicine, University of Occupational and Environmental Health, Japan.
2. Department of Occupational Pneumology, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, Japan.
3. Department of Occupational Toxicology, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, Japan.
4. Second Department of Surgery, School of Medicine, University of Occupational and Environmental Health, Japan.
5. Department of Ophthalmology-Head and Neck Surgery, School of Medicine, University of Occupational and Environmental Health, Japan.
6. The President's Office, University of Occupational and Environmental Health, Japan.