1. Faculty of Biology and Medicine; University of Lausanne; Switzerland
2. Department of Diagnostic and Interventional Radiology; University Hospital Center and University of Lausanne (CHUV-UNIL); Rue du Bugnon 46 1011 Lausanne Switzerland
3. Department of Radiology, Division of Neuroradiology; Stanford University; 300 Pasteur Drive, Room S039 Stanford CA 94305-5105 United States