1. Department of Radiology, Medical Imaging Center (MIC)University Medical Center Groningen Groningen the Netherlands
2. Department of Radiology and Nuclear MedicineErasmus Medical Center Rotterdam the Netherlands
3. Department of RadiologyUniversity Medical Center Utrecht Utrecht the Netherlands
4. Department of NeurologyUniversity Medical Center Groningen Groningen the Netherlands
5. Brain Tumour Imaging Group, Division of Neurosurgery, Department of Clinical NeurosciencesUniversity of Cambridge and Addenbrooke's Hospital Cambridge UK