1. Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, No. 1 Jianshe East Road, Zhengzhou 450052, Henan, China
2. Department of Geriatric Endocrinology, The First Hospital Affiliated to Nanjing Medical University, Nanjing, Jiangsu 210029, P. R. China
3. Department of Spinal Surgery, The First Hospital of Jilin University, Jilin Engineering Research Center For Spine and Spinal Cord Injury, 1 Xinmin St, Changchun, 130021, China