1. Department of Neurology, The Fifth Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530022, China
2. Department of Neurology, Affiliated Hospital of Youjiang Medical University for Nationalities, Baise 533000, China
3. Department of Neurology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, China
4. Department of Biology, Pennsylvania State University, University Park, PA 16802, USA