Bermúdez-Guerrero, F. J. .; Gómez-Camargo, D. .; Palomino-Romero, R. .; Llamas-Bustos, W. .; Ramos-Clason, E. . A Comparative Analysis of 3 Sedation Guidelines for Patients Undergoing Subarachnoid Anesthesia. Randomized, Single Blind Clinical Trial. Colomb. J. Anesthesiol. 2015, 43, 122-128.