1. Xi’an Medical Uniyersity, Xi’an, Shaanxi, China (mainland)
2. Department of Spine Surgery, Honghui Hospital, Xi’an Jiaotong University, Xi’an, Shaanxi, China (mainland)
3. Department of Spine Surgery, Honghui Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)