1. Division of General Internal Medicine, Department of Medicine St. Luke's International Hospital Tokyo Japan
2. Department of Epidemiology St. Luke's International University Graduate School of Public Health Tokyo Japan
3. Fujita Heath University Toyoake Japan
4. Department of Psychiatry Columbia University New York USA
5. Ohta Nishinouchi Hospital Koriyama Japan
6. Department of Neuropsychiatry Graduate School of Medical Sciences, Kyushu University Fukuoka Japan
7. Department of Psychiatry Harvard Medical School Boston USA