1. Yokohama Medical Network for Maltreated Children, Child and Youth Bureau; Yokohama Municipal Government; Yokohama, Kanagawa Japan
2. Department of Pediatrics; Yokohama Rosai Hospital; Yokohama Kanagawa Japan
3. Department of Pediatrics; Yokohama City Minato Red Cross Hospital; Yokohama, Kanagawa Japan
4. Department of Pediatrics; Yokohama City University Graduate School of Medicine; Yokohama, Kanagawa Japan