A. E. Herrera, V. . Mojica, D. . Nieuwveld, A. . Prats-Galino, A. M. . López, and X. . Sala-Blanch, “Ultrasound guided supraclavicular perivascular block. Anatomical, technical medial approach description and changes in regional perfusion”, Colomb. J. Anesthesiol., vol. 45, no. 4, pp. 272–279, Oct. 2017.