1. Department of Psychiatry, Juntendo University Nerima Hospital, Tokyo, Japan
2. Department of Psychiatry, Nippon Medical School Musashikosugi Hospital, Kawasaki, Japan
3. Department of Psychiatry, Hiroshima City Hospital, Hiroshima, Japan
4. Department of Psychiatry, Tokyo Medical and Dental University, Tokyo, Japan
5. Psychiatric Center Yokohama City University Medical Center, Yokohama, Japan
6. Department of Environmental and Preventive Medicine, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan