2 Department of Laboratory Medicine, Beijing Jishuitan Hospital, Capital Medical University, Fourth Clinical College of Peking University, Beijing.
3 Department of Orthopaedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing.
4 Department of Spinal Surgery, Shihezi General Hospital of the Eighth Division, Shihezi.
5 Department of Spine Surgery, Beijing Jishuitan Hospital, Capital Medical University, Fourth Clinical College of Peking University, National Center for Orthopaedics, Beijing, People's Republic of China.