1. Departments of Radiology and Public Health Charlottesville, University of Virginia, VA, USA
2. Department of Neurology, Guangdong No.2 Provincial People's Hospital, Guangzhou, Guangdong, China
3. Department of Neurology, CHUV Lausanne, University of Lausanne, Switzerland
4. Department of Neurology, University of Pittsburgh, Pittsburgh, PA
5. Department of Radiology, Stanford University, Stanford, CA