1. Department of Orthopedic Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA
2. Department of Orthopedic Surgery, Medical Research Institute, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Yangsan, Republic of Korea
3. Department of Orthopedic Surgery, Spine Surgery, Toyonaka Municipal Hospital, Osaka, Japan
4. University of Queensland School of Medicine, Ochsner Clinical School, Queensland, Australia
5. Department of Orthopedic Surgery, Grossman School of Medicine, New York University, New York, NY