1. Department of Neurosurgery, Inselspital, Bern University-Hospital, Bern, Switzerland;
2. Department of Neurosurgery, Kantonsspital St. Gallen, St. Gallen, Switzerland;
3. CTU Bern, University of Bern, Bern, Switzerland;
4. Department of Neurosurgery, Kantonspital Aarau, Aarau, Switzerland;
5. Department of Neurosurgery, Clinical Neuroscience Center, University-Hospital Zurich and University of Zurich, Zurich, Switzerland;
6. Department of Neurosurgery, Hospital of the University of Pennsylvania, Penn Medicine, Philadelphia, Pennsylvania, USA;
7. Department of Neurosurgery, University-Hospital Basel, University of Basel, Basel, Switzerland;
8. Department of Surgery, Neurology, and Radiology, Maimonides Medical Center, Brooklyn, USA;
9. Swiss Medical Network, Clinique de Genolier, Genolier, Switzerland;
10. Department of Neurosurgery, University-Hospital Lausanne, Lausanne, Switzerland;
11. Department of Neurosurgery, University-Hospital Geneva, Geneva, Switzerland;
12. Department of Neurosurgery, Medical Center, University of Freiburg, Freiburg, Germany;
13. Department of Neurosurgery, University-Hospital Rennes, Rennes, France