1 Department of Neurology and Brain Tumor Center, University Hospital and University of Zurich, Zurich, Switzerland.
2 Institute of Neuropathology, Heinrich Heine University, Medical Faculty, Düsseldorf, Germany.
3 Department of Neuropathology, Institute of Pathology, University Heidelberg and Clinical Cooperation Unit Neuropathology, German Cancer Research Center, Heidelberg, Germany.
4 Department of Neuropathology, University Hospital and University of Zurich, Zurich, Switzerland.
5 German Cancer Consortium, partner site Essen/Düsseldorf, German Cancer Research Center, Heidelberg, Germany.