1. Department of Psychiatry Yokohama City University Graduate School of Medicine Yokohama Japan
2. Department of Nursing Yokohama City University School of Medicine Yokohama Japan
3. Department of Psychiatry Yokohama City University School of Medicine Yokohama Japan
4. Tsukuba Psychosomatic Clinic Tsuchiura Japan
5. Department of Biostatistics Yokohama City University School of Medicine Yokohama Japan
6. Department of Child Psychiatry Yokohama City University Hospital Yokohama Japan