1. Fukunaga Clinic
2. Akita Rosai Hospital, Japan Organization of Occupational Health and Safe
3. Department of Hygiene, Kitasato University School of Medicine
4. Department of Epidemiology and Environmental Health, Juntendo University Faculty of Medicine
5. Department of Hematology, Nephrology, and Rheumatology, Akita University Graduate School of Medicine
6. Ogachi Central Hospital