1. Department of Pediatrics and Developmental Biology, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
2. Department of Pediatrics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima 734-8553, Japan
3. Department of Pediatrics, Keio University School of Medicine, Tokyo 160-8582, Japan
4. Division of Endocrinology and Metabolism, Tokyo Metropolitan Children’s Medical Center, Tokyo 183-8561, Japan
5. Department of Pediatrics, Jichi Medical University, Tochigi 329-0498, Japan
6. Department of Gastroenterology and Endocrinology, Osaka Women’s and Children’s Hospital, Osaka 594-1101, Japan