1. Department of Diagnostic and Interventional Radiology, University Hospital, Lausanne, Switzerland
2. Department of Pediatrics, University Hospital, Lausanne, Switzerland
3. Biostatistics Unit, University Institute of Social and Preventive Medicine, Lausanne, Switzerland
4. Department of Neurosurgery, University Hospital, Lausanne, Switzerland
5. University Institute of Applied Radiophysics, Lausanne, Switzerland