1. Department of Public Health, Sagami Railway Co. Ltd. Yokohama, Japan
2. National Defense Medical College Saitama Departments of Hygiene, Sagami Railway Co. Ltd. Yokohama, Japan
3. School of Medicine, Keio University Tokyo Department of Public Health, Sagami Railway Co. Ltd. Yokohama, Japan
4. School of Medicine, Juntendo University Tokyo Medical Clinic Yokohama, Japan
5. Department of 2nd Surgery, School of Medicine, Kyorin University Tokyo Department of Preventive Medicine and Public Health, Sagami Railway Co. Ltd. Yokohama, Japan