M. A. . Arcila Lotero, R. . Rivera Díaz, M. A. . Mejía Aguilar, and S. . Jaramillo Jaramillo, “Efficacy and safety of ultrasound-guided saphenous nerve block in patients with chronic knee pain”, Colomb. J. Anesthesiol., vol. 42, no. 3, pp. 166–171, Jul. 2014.