1. Department of Preventive Medicine, Tokai University School of Medicine, Isehara, Japan
2. Research Support Center, Shizuoka General Hospital, Shizuoka, Japan
3. Center of Public Health Informatics, National Institute of Public Health, Wako, Japan
4. Department of Hygiene, School of Medicine, Kitasato University, Sagamihara, Japan
5. Chugoku Rosai Hospital Research Center for the Promotion of Health and Employment Support, Japan Organization of Occupational Health and Safety, Kure, Japan