1. Department of Neurology; University of Tennessee Health Science Center; Memphis Tennessee
2. Second Department of Neurology; “Attikon University Hospital”; School of Medicine; University of Athens; Athens Greece
3. International Clinical Research Center; St. Anne's University Hospital in Brno; Brno Czech Republic
4. Stroke Unit; Department of Neurology; Brugmann University Hospital; Brussels Belgium
5. Stroke Unit; Metropolitan Hospital; Athens Greece
6. Department of Neurosurgery; Semmes-Murphey Neurologic and Spine Institute; University of Tennessee Health Science Center; Memphis Tennessee