Rojas-Gómez, María Fernanda, and Antonio José Bonilla-R. “Perioperative Ultrasound: The Challenge of Applying an Old Technology in New Clinical Settings”. Colombian Journal of Anesthesiology, vol. 44, no. 4, Oct. 2016, pp. 267–269, https://www.revcolanest.com.co/index.php/rca/article/view/594.