1. Department of Diagnostic Imaging, University Children's Hospital Zurich, Zurich, Switzerland
2. Klinikum Klagenfurt, Institute of Diagnostic and Interventional Radiology, Klagenfurt, Austria
3. Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Zurich, Zurich, Switzerland
4. Department of Pediatric Neurology, University Children's Hospital Zurich, Zurich, Switzerland