1. Department of Orthopedic Surgery, Second Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia Autonomous Region 010030, P.R. China
2. Department of Orthopedic Surgery, Inner Mongolia Hospital of Traditional Chinese Medicine, Hohhot, Inner Mongolia Autonomous Region 010010, P.R. China
3. Department of Orthopedic Surgery, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150000, P.R. China