1. Department of Knee Joint Surgery, Honghui Hospital, Xi’an Jiaotong University, Xi’an, Shaanxi Province, China
2. The First Clinical Medical College, Shaanxi University of Chinese Medicine, Xi’an, Shaanxi Province, China
3. State Key Laboratory of Cancer Biology, Department of Pathology, The First Affiliated Hospital of Air Force Military Medical University, Xi’an, Shaanxi Province, China
4. Department of Health Statistics, Faculty of Preventive Medicine, the Air Force Military Medical University, Xi’an, Shaanxi Province, China.