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. Psychiatric Center Yokohama City University Medical Center Yokohama Japan
5. Department of Psychiatry Tokyo Medical and Dental University Tokyo Japan
6. Department of Psychiatry, Saitama Medical Center Saitama Medical University Kawagoe Japan
7. Department of Psychiatry Kurashiki Central Hospital Kurashiki Japan
8. Psycho‐Oncology Division National Cancer Center Hospital Tokyo Japan
9. Department of Psychiatry Kurume University School of Medicine Kurume Japan
10. Department of Psychiatry Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital Tokyo Japan
11. Department of Psychiatry Japanese Red Cross Kyoto Daiichi Hospital Kyoto Japan
12. Department of Psychiatry Fukuyama City Hospital Fukuyama Japan
13. Department of Psychiatry Tokyo Women's Medical University Tokyo Japan
14. Department of Psychiatry Tokushima Prefectural Central Hospital Tokushima Japan
15. Department of Environmental and Preventive Medicine Kanazawa University Graduate School of Medical Science Kanazawa Japan