1. Department of Infectious Diseases, Xiangya Hospital, Central South University, Changsha, China
2. Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester Minnesota, USA
3. Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China
4. National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
5. Department of Radiology, The Second Xiangya Hospital, Central South University, Changsha, China