1. Department of Comprehensive Internal Medicine, Guangxi Medical University Cancer Hospital, Nanning, Guangxi 530022, P.R. China
2. Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
3. Department of Spine and Osteopathy Surgery, Guangxi Medical University First Affiliated Hospital, Nanning, Guangxi 530022, P.R. China