1. Department of Orthopaedics, Hunan Engineering Laboratory of Advanced Artificial Osteo-Materials, National Clinical Research Center for Geriatric Disorders, Xiangya Hospital of Central South University 1 , Changsha, Hunan 410008, China
2. Department of Gastroenterology, Hunan Engineering Laboratory of Advanced Artificial Osteo-Materials, National Clinical Research Center for Geriatric Disorders, Xiangya Hospital of Central South University 2 , Changsha, Hunan 410008, China