1. Neuroradiology Division; Department of Radiology; Massachusetts General Hospital; Boston MA
2. Department of Radiology; King Chulalongkorn Memorial Hospital; Thai Red Cross Society; Bangkok Thailand
3. Department of Radiology; Athinoula A. Martinos Center for Biomedical Imaging; Harvard Medical School; Massachusetts General Hospital; Charlestown MA
4. Neuroradiology Division; Department of Radiology; Ohio State University; Columbus OH
5. Neuroradiology Division; Department of Radiology; New York University School of Medicine; New York NY
6. Siemens Medical Solutions USA; Charlestown MA