1. Department of Environmental Epidemiology, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, Japan
2. Research Center for Overwork-Related Disorders, National Institute of Occupational Safety and Health, Japan
3. Department of Obstetrics & Gynecology, Japanese Red Cross Medical Center
4. Department of Psychiatry, Mitsui Memorial Hospital
5. Exective Boards, Japan Medical Association
6. Japan Medical Association