2 Computer-Assisted Medical Interventions, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 581, 69120, Heidelberg, Germany. l.maier-hein@dkfz-heidelberg.de.
3 Department of Computer Science, Ulm University of Applied Sciences, Albert-Einstein-Allee 55, 89081, Ulm, Germany.
4 Modeling Surgical Knowledge and Processes, U1099 INSERM Rennes, Faculté de Médecine, Université de Rennes 1, CS34317, 35043, Rennes cedex, France.
5 Neurology and Neurosurgery, Biomedical Engineering, McGill University, 3801 University Street, Montreal, QC, H3A 2B4, Canada.
6 Radiology Department, Université Laval, 2601 Chemin de la Canardière, Québec, QC, G1J 2G3, Canada.