1. From the Department of Neurology (A.S., W.P.), Goethe University Frankfurt, Germany.
2. Institute of Neuroradiology (S.K., A.G., J.R.S., E.H., U.P., M.W.), Goethe University Frankfurt, Germany.
3. Brain Imaging Center (R.D., U.N.), Goethe University Frankfurt, Germany.
4. Department of Vascular Surgery (M.K.), Goethe University Frankfurt, Germany.