1. Department of Oncology; University Children's Hospital; Zurich Switzerland
2. Children's Research Centre; University Children's Hospital; Zurich Switzerland
3. Department of Neurology; University Children's Hospital; Zurich Switzerland
4. Department of Neurosurgery; University Hospital; Zurich Switzerland
5. Division of Infectious Diseases and Hospital Epidemiology; University Children's Hospital; Zurich Switzerland
6. Department of Diagnostic Imaging; University Children's Hospital; Zurich Switzerland