1 Department of Neurology, Erasmus MC, University Medical Center, Ee2240, PO Box 2040, 3000 CA Rotterdam, The Netherlands; Department of Radiology and Nuclear Medicine, Erasmus MC University Medical Center, Ee2240, PO Box 2040, 3000 CA Rotterdam, The Netherlands.
2 Department of Neurology, Erasmus MC, University Medical Center, Ee2240, PO Box 2040, 3000 CA Rotterdam, The Netherlands. Electronic address: d.dippel@erasmusmc.nl.