1. Department of Psychiatry University of Tsukuba Hospital 2‐1‐1 Amakubo, Tsukuba Ibaraki 305‐8576 Japan
2. University of Tsukuba Hospital 2‐1‐1 Amakubo, Tsukuba Ibaraki 305‐8576 Japan
3. Department of Disaster and Community Psychiatry, Division of Clinical Medicine, Faculty of Medicine University of Tsukuba 1‐1‐1 Tennoudai, Tsukuba Ibaraki 305‐8575 Japan
4. Department of Psychiatry, Faculty of Medicine University of Tsukuba 1‐1‐1 Tennoudai, Tsukuba Ibaraki 305‐8575 Japan