1. Department of Pediatrics, Hiroshima University Graduate School of Biomedical Sciences
2. Department of Pediatrics, Kure Mutual Hospital
3. Department of Neonatology, Hiroshima Prefectual Hospital
4. Department of Neonatology, Hiroshima City Hospital
5. Department of Bone and Mineral Research, Osaka Medical Centre and Research Institute for Maternal and Child Health
6. Department of Pediatrics, Osaka University Graduate School of Medicine