1. Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, 510515 Guangzhou, China
2. Department of Orthopaedic Surgery, Zengcheng Branch of Nanfang Hospital, Southern Medical University, 511338 Guangzhou, China
3. Guangzhou Huatai 3D Material Manufacture Ltd., Co., 511300 Guangzhou, China
4. Department of Anatomy, College of Basic Medicine, Dalian Medical University, Dalian 116044, China