1. Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
2. Department of Pediatrics, National Hospital Organization Kyushu Medical Center, Fukuoka, Japan
3. Department of Orthopedics, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
4. Department of Anatomic Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
5. Department of Pediatrics, Oita University Faculty of Medicine, Yufu, Japan