1. Department of Psychiatry and Center for Morita Therapy, The Jikei University Daisan Hospital, Komae-shi, Tokyo 201-8601, Japan
2. Department of Psychiatry, The Jikei University School of Medicine, Minato-ku, Tokyo 105-8461, Japan
3. Graduate School of Social Well-Being Studies, Hosei University, Machida-shi, Tokyo 194-0298, Japan