1 Center for Complex Microvascular Surgery and Department of Neurosurgery, Erasmus MC Stroke Center, Erasmus MC University Medical Center, Rotterdam 3015 GD, Netherlands. Electronic address: v.volovici@erasmusmc.nl.
2 Department of Neurosurgery, Grande Ospedale Metropolitano Niguarda, Milan, Italy.
3 Department of Neurosurgery, Rigshospitalet, Copenhagen, Denmark.
4 University Hospital Pirogov, Sofia, Bulgaria.
5 Ceske Budejovice Hospital, České Budějovice, Czech Republic.
6 University Hospital Mannheim, Medical Faculty Mannheim, University of Heidelberg, Germany.
7 University Hospital Zurich, University of Zurich, Zurich, Switzerland.
8 Bern University Hospital and University of Bern, Bern, Switzerland.