1. Department of Orthopedic Surgery, Taipei Medical University Hospital, Taipei, Taiwan
2. Department of Orthopedics, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
3. Department of Orthopedic Surgery, Kyung Hee University Hospital at Gangdong, Seoul, Republic of Korea
4. Department of Orthopedic Surgery, Osaka City University Graduate School of Medicine, Osaka, Japan
5. University of New Mexico School of Medicine, Albuquerque, NM, USA
6. Desert Institute for Spine Care, Phoenix, AZ, USA
7. Department of Orthopedics, West China Hospital of Sichuan University, Chengdu, China