1. The Graduate School, Tianjin Medical University, Tianjin, China (mainland)
2. Department of Neurology, Tianjin Huanhu Hospital, Tianjin, China (mainland)
3. Department of Neurology, Baotou Central Hospital, Baotou, Inner Mongolia, China (mainland)
4. Department of Neurology, Tianjin Neurological Institute, Tianjin Medical University General Hospital, Tianjin, China (mainland)
5. Department of Neurology, Tianjin Fourth Central Hospital, Tianjin, China (mainland)
6. Department of Ultrasonography, Tianjin Huanhu Hospital, Tianjin, China (mainland)
7. Department of Radiology, Tianjin Huanhu Hospital, Tianjin, China (mainland)