1. Department of Orthopaedics, Xijing Hospital, the Air Force Medical University, Xi’an, Shaanxi, P.R. China
2. Department of Orthopaedics, Air Force Hospital of Eastern Theater Command, Nanjing, Jiangsu, P.R. China
3. Department of Radiology, Xijing Hospital, the Air Force Medical University, Xi’an, Shaanxi, P.R. China
4. Department of Thoracic Surgery, Tangdu Hospital, the Air Force Medical University, Xi’an, Shaanxi, P.R. China