1. Department of Pediatric Internal Medicine, Affiliated Hospital of Chengde Medical University, Chengde, Hebei Province, P.R. China;
2. Department of Spinal Surgery, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, P.R. China;
3. Department of Orthopedics, Tianjin Medical University General Hospital, Tianjin, P.R. China;
4. Department of Spine Surgery, Beijing Luhe Hospital, Capital Medical University, Beijing, P.R. China;
5. Department of Orthopedics, Chengde Central Hospital, Chengde, Hebei Province, P.R. China;
6. Leukemia Center, Chinese Academy of Medical Sciences & Peking Union of Medical College, Institute of Hematology & Hospital of Blood Diseases, Tianjin, P.R. China;
7. Department of Orthopedics, The 266th Hospital of the Chinese People’s Liberation Army, Chengde, Hebei Province, P.R. China;
8. Department of Sports injury and Arthroscopy, Tianjin Hospital, Tianjin, P.R. China;
9. Department of Neurology, The 266th Hospital of the Chinese People’s Liberation Army, Chengde, Hebei Province, P.R. China