2 Universidade de Santiago de Compostela, Campus Terra, Spain. Electronic address: ruben.navarro.paton@usc.es.
3 Division of Nursing, Cantabrian Health Service 061, Cantabria, Spain. Electronic address: javier.mateos@scsalud.es.
4 Education and Research Departament, Emergency Medical Service Fundación Pública Urgencias Sanitarias 061 Conselleria de Sanidade, Santiago de Compostela, Spain. Electronic address: antonio.iglesias.vazquez@sergas.es.