1 Department of NeuroradiologyNeurocenter of Southern SwitzerlandEnte Ospedaliero CantonaleLugano, Switzerland.
2 Department of NeurologyNeurocenter of Southern SwitzerlandEnte Ospedaliero CantonaleLugano, Switzerland.
3 Unit of Clinical EpidemiologyEnte Ospedaliero CantonaleBellinzona, SwitzerlandDepartment of Intensive Care MedicineEnte Ospedaliero CantonaleMendrisio, SwitzerlandDivision of PneumologyUniversity Hospital of GenevaGeneva, Switzerland.
4 Department of NeuroradiologyNeurocenter of Southern SwitzerlandEnte Ospedaliero CantonaleLugano, SwitzerlandFaculty of Biomedical SciencesUniversità della Svizzera ItalianaLugano, Switzerland.
5 Department of Health ScienceUniversity of GenovaGenova, Italy.
6 Department of NeuroradiologyInselspital Bern, University of BernBern, SwitzerlandDepartment of NeuroradiologyNeurocenter of Southern SwitzerlandEnte Ospedaliero CantonaleLugano, Switzerland.