1. From the Department of Neurology (L.G.-L., N. Möhn, G.U.H., T.S.); Institute of Transfusion Medicine and Transplant Engineering (A.B., S.T.-Z., B.E.-V.), Hannover Medical School; Department of Neurology (F.S., C.W.), Faculty of Medicine and University Hospital Cologne, University of Cologne; Department of Diagnostic and Interventional Neuroradiology (N. Mahmoudi, M.P.W.), Hannover Medical School; National Reference Center for Papilloma- and Polyomaviruses (S.S.), Institute of Virology, University of...