1. Department of Pathology, The First Hospital of Yulin, Yulin, Shaanxi 719000, P.R. China
2. Department of Geriatrics, The First Hospital of Yulin, Yulin, Shaanxi 719000, P.R. China
3. Department of Pathology, North China University of Science and Technology Affiliated Hospital, Tangshan, Hebei 063000, P.R. China
4. Department of Orthopedics, The First Hospital of Yulin, Yulin, Shaanxi 719000, P.R. China