1 Division of Pediatrics, Department of Homeostatic Regulation and Development, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
2 Division of Pediatrics, Department of Homeostatic Regulation and Development, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan. Electronic address: nyuzuki@med.niigata-u.ac.jp.
3 Division of Orthopaedic Surgery, Department of Reconstructive and Transplant Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
4 Division of Comprehensive Musculoskeletal Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.