1. Department of Pediatrics, Tokushima University Hospital, Kuramotocho, Tokushima, Tokushima, Japan
2. Department of Pediatrics, Tokushima Municipal Hospital, Kitajyosanjimacho, Tokushima, Tokushima, Japan
3. Department of Obstetrics and Gynecology, Tokushima University Hospital, Kuramotocho, Tokushima, Tokushima, Japan