1. Division of Endocrinology and Metabolism, Tokyo Metropolitan Children’s Medical Center, Fuchu 183-8561, Japan
2. Department of General Pediatrics, Tokyo Metropolitan Children’s Medical Center, Fuchu 183-8561, Japan
3. Division of Hematology, Kanagawa Children’s Medical Center, Yokohama 232-8555, Japan
4. Division of Cardiology, Tokyo Metropolitan Children’s Medical Center, Fuchu 183-8561, Japan