1. Faculty of Sociology, Shikoku Gakuin University, Zentsuji-shi 765-8505, Kagawa, Japan
2. Department of Clinical Psychology, Faculty of Medicine, Kagawa University, Miki-cho 761-0701, Kagawa, Japan
3. Department of Hygiene, Faculty of Medicine, Kagawa University, Miki-cho 761-0701, Kagawa, Japan