1. Department of Spine Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China (mainland)
2. Department of Orthopaedics, People’s Hospital of Quzhou, Quzhou, Zhejiang, China (mainland)
3. Anatomical Institute of Minimally Invasive Surgery, Southern Medical University, Guangzhou, Guangdong, China (mainland)