1. Department of Otorhinolaryngology, Tianjin Medical University General Hospital, Tianjin, China
2. Department of Neurology, Tianjin Medical University General Hospital, Tianjin, China
3. Laboratory of Epidemiology, Tianjin Neurological Institute., Tianjin, China
4. Key Laboratory of Post-Neuroinjury Neuro-repair and Regeneration in Central Nervous System, Tianjin Neurological Institute, Ministry of Education and Tianjin City, Tianjin, China
5. Department of Otorhinolaryngology, Beijing Tsinghua Changgung Hospital, School of Clinical Medicine, Tsinghua University, Beijing, China