1. Department of Diagnostic and Interventional Neuroradiology, University Hospital RWTH Aachen, Pauwelsstraße 30, 52074 Aachen, Germany
2. Institute of Neurosciences and Medicine 4 (INM-4), Forschungszentrum Jülich, 52425 Jülich, Germany
3. Department of Radiology, Antwerp University Hospital, Drie Eikenstraat 655, 2650 Edegem, Belgium