1. Department of Orthopaedic Surgery, Hyogo Medical University, Nishinomiya 663-8131, Japan
2. Department of Orthopaedic Surgery, Miyoshi Hospital, Miyoshi 778-0005, Japan
3. Department of Orthopaedic Surgery, Daiwa Central Hospital, Osaka 557-0025, Japan
4. Department of Orthopaedic Surgery, Goushi Hospital, Nagasu Nishidori 660-0807, Japan
5. Department of Orthopaedic Surgery, Harima Hospital, Asahi Aioi 678-0031, Japan
6. Department of Orthopaedic Surgery, Osaka Minato Central Hospital, Osaka 552-0003, Japan
7. Department of Orthopaedic Surgery, Takarazuka City Hospital, Takarazuka 665-0827, Japan
8. Department of Orthopaedic Surgery, Sasayama Medical Center, Hyogo Medical University, Tamba-Sasayama 669-2321, Japan