1 Department of Neurosurgery, University Hospital Frankfurt, Frankfurt, Germany.
2 Department of Neurosurgery, Neurosurgical Center Amsterdam, Amsterdam, Netherlands.
3 Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA, United States.
4 Department of Neurology and Interdisciplinary Neuro-Oncology, Hertie Institute for Clinical Brain Research, Eberhard-Karls University of Tübingen, Tübingen, Germany.
5 Center for Neuro-Oncology, Comprehensive Cancer Center Tübingen-Stuttgart, University Hospital of Tuebingen, Eberhard Karls University of Tübingen, Tübingen, Germany.
6 Department of Neurosurgery, University Hospital Tübingen, Eberhard Karls University Tübingen, Tübingen, Germany.