1. Department of Neurology; Beijing Tiantan Hospital affiliated Capital Medical University; Beijing China
2. Department of Neurology; OSF Healthcare Systems; Illinois Neurological Institute Stroke Network; University of Illinois College of Medicine at Peoria; Peoria IL USA
3. Department of Neurosurgery; Wayne State University; Detroit MI USA
4. Department of Ultrasound; Beijing Tiantan Hospital affiliated Capital Medical University; Beijing China