1. Department of Infectious Disease, Tianjin Second People's Hospital, Tianjin 300192, China
2. Center of Epidemiology and Department of Neurology, Tianjin Medical University General Hospital, Tianjin 300052, China
3. Tianjin Neurological Institute, Key Laboratory of Post-Neuroinjury Neuro-repair and Regeneration in Central Nervous System, Ministry of Education and Tianjin City, Tianjin 300052, China
4. Department of Epidemiology, Tianjin Neurological Institute, Tianjin 300052, China