1. Department of Geriatrics, 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. Centre of Ultrasound, Tianjin Medical University General Hospital, Tianjin, China