1. Department of Psychiatry Sunagawa City Medical Center Sunagawa Japan
2. Department of Psychiatry Nishi Kumagaya Hospital Kumagaya Japan
3. School of Nursing and Social Services Health Sciences University of Hokkaido Tobetsu Japan
4. Department of Psychiatry Otaru General Hospital Otaru Japan
5. Department of Psychiatry, Sapporo Sato Hospital Sapporo Japan