1. Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing 400037, P.R. China
2. Medical Research Center, Southwestern Hospital, Army Medical University, Chongqing 400037, P.R. China
3. Department of Orthopedics, General Hospital of Shenyang Military Area Command of Chinese PLA, Shenyang, Liaoning 110016, P.R. China