1. Rehabilitation Center, The Second Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010000, P.R. China
2. Department of Joint Surgery, The Second Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010030, P.R. China
3. Department of ICU (Intensive Care Unit), The Second Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010030, P.R. China
4. Department of Education office, The Second Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010030, P.R. China