1. From the Department of Neuroradiology (J.F., M.B., H.K., S.G.), University Hospital Hamburg-Eppendorf, Germany
2. Department of Neurology (G.T.), University Hospital Hamburg-Eppendorf, Germany
3. Department of Neuroradiology, Augsburg Hospital, Germany (A.B.)
4. Department of Neuroradiology, University Hospital, LMU Munich, Germany (F.D.)
5. Department of Neuroradiology, Asklepios Klinik Altona, Germany (B.E.)
6. Department of Radiology, University Hospital Muenster, Germany (A.K.)
7. Department of Neuroradiology, University Hospital Rostock, Germany (S.L.)
8. Department of Neuroradiology, Cantonal Hospital Aarau, Switzerland (L.R.)
9. Department of Neuroradiology, Saarland University Medical Center, Homburg-Saar, Germany (W.R.)
10. Department of Radiology and Neuroradiology, Klinikum Dortmund, Germany (S.R.)
11. Department of Neuroradiology, Heidelberg University Hospital, Heidelberg, Germany (M.M., M.B.)
12. Radiology and Hotchkiss Brain Institute, University of Calgary, Alberta, Canada (N.D.F.).