1. Department of Orthopedic Surgery, Gifu Municipal Hospital, 7-1 Kashima-cho, Gifu 500-8513, Japan
2. Department of Diagnostic Pathology, Gifu Municipal Hospital, 7-1 Kashima-cho, Gifu 500-8513, Japan
3. Department of Orthopedic Surgery, Gifu University School of Medicine, 1-1 Yanagido, Gifu 501-1194, Japan