1. Division of Orthopaedics & Traumatology, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
2. Department of Medical Quality Management, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
3. Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China