1. Department of Orthopaedics, Chinese PLA General Hospital, Medical School of Chinese People’s Liberation Army (PLA), Beijing, China (mainland)
2. Department of Orthopaedics, Rocket Force General Hospital of People’s Liberation Army (PLA), Beijing, China (mainland)
3. Department of Orthopaedics, Beijing Pinggu Hospital, Beijing, China (mainland)
4. Department of Anesthesiology, 532 Hospital of People’s Liberation Army (PLA), Beijing, China (mainland)