1. Department of Pediatrics, Tohoku University School of Medicine, Sendai 980-8574, Japan
2. Department of Pediatrics, Tome City Maiya Hospital, Tome 987-0500, Japan
3. Department of Pediatrics, National Hospital Organization Sendai Medical Center, Sendai 983-0045, Japan
4. Department of Pediatrics, Sendai City Hospital, Sendai 982-8502, Japan
5. Department of Orthopaedic Surgery, Tohoku University School of Medicine, Sendai 980-8574, Japan
6. Department of Nephrology and Endocrinology, Osaki Citizen Hospital, Osaki 989-6136, Japan