1. Institute of Biomedical Sciences Abel Salazar; University of Oporto; Oporto; Portugal
2. Department of Anaesthesia; Centro Hospitalar São João; EPE; Oporto; Portugal
3. Center for Medical Education; University of Oporto; Oporto; Portugal
4. Faculty of Dental Medicine; University of Oporto; Oporto; Portugal
5. Department of Surgery; Faculty of Medicine; University of Oporto; Oporto; Portugal