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