1. Department of Neurooncology, National Center for Tumor Disease and German Cancer Research Center, Heidelberg, Germany
2. Department of Neurology, University Hospital Zurich, Switzerland
3. Department of Neuro-Oncology, Daniel den Hoed Cancer Center/Erasmus University Hospital Rotterdam, Rotterdam, the Netherlands
4. Centre Hospitalier Universitaire Vaudois and University of Lausanne, Departments of Oncology and Neurosurgery, Lausanne, Switzerland