L. . Girón-Arango, M. I. . Vásquez-Sadder, M. P. . González-Obregón, and C. E. Gamero-Fajardo, “Ultrasound-guided ankle block: An attractive anaesthetic technique for foot surgery”, Colomb. J. Anesthesiol., vol. 43, no. 4, pp. 283–289, Oct. 2015.