1. Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki 305-8575, Japan
2. College of Nursing and Nutrition, Shukutoku University, Chiba 260-8703, Japan
3. Department of Disaster and Community Psychiatry, Institute of Medicine, University of Tsukuba, Ibaraki 305-8575, Japan
4. School of Humanities, Hokusei Gakuen University, Hokkaido 004-8631, Japan
5. Department of Psychiatry, Nanao Hospital, Tokyo 191-0055, Japan
6. Department of Psychiatry, Teikyo University, Tokyo 173-8606, Japan