M. F. . Rojas-Gómez, R. . Blanco-Dávila, V. . Tobar-Roa, A. M. . Gómez-González, . A. M. . Ortiz-Zableh, and A. . Ortiz-Azuero, “Regional anesthesia guided by ultrasound in the pudendal nerve territory”, Colomb. J. Anesthesiol., vol. 45, no. 3, pp. 200–209, Jul. 2017.