P415Yawning as a protective mechanism and predictor of syncope, observational study in a cohort of patients. (19th March 2018) - Duque, M; Cortez, O; Duque, L; Gaviria, M C; Vasquez, E M; Diaz, J C; Marin, J E; Aristizabal, J M; Velasquez, J E; Uribe, W