1. Department of Endocrinology & Metabolism, Clinical Research Institute, Kanagawa Children's Medical Center
2. Department of Neonatology, Kanagawa Children's Medical Center
3. Department of Pediatrics, Hokkaido University School of Medicine
4. Department of Neonatology, Sapporo City General Hospital
5. International Research and Educational Institute for Integrated Medical Science, Tokyo Women's Medical University
6. Department of Pediatrics, Asahikawa Medical College