1. Medical Equipment Management Office, the Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
2. Departments of Radiology, the Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China
3. Department of Orthopaedics, the Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China