1. Department of Neurosurgery, Inselspital Bern University Hospital, University Bern Bern Switzerland
2. Thuy Hospital Universitario Central de Asturias Oviedo Spain
3. Department of Neurosurgery Medical School Hannover Hannover Germany
4. ARTORG Center for Biomedical Engineering Research University of Bern Bern Switzerland
5. Nuffield Department of Clinical Neuroscience University of Oxford Oxford UK
6. Department of Neurosurgery, Centre Hospitalier Universitaire de Nice, FHU INOVPAIN University Cote d'Azur Nice France