1. Department of Mental HealthGraduate School of Medicine, The University of TokyoTokyoJapan
2. Department of HygieneSchool of Medicine, Wakayama Medical UniversityWakayamaJapan
3. Health Administration and Psychosocial Factor Research GroupNational Institute of Occupational Safety and Health, JapanKawasakiJapan
4. Chugai Pharmaceutical Co., Ltd.TokyoJapan