Medina-Ramírez, Santiago, et al. “Prophylactic Percutaneous Dilatational Cricothyrotomy, Prior to Surgical Tracheostomy: Case Report”. Colombian Journal of Anesthesiology, vol. 45, no. Supplement, Apr. 2017, pp. 16-20, https://www.revcolanest.com.co/index.php/rca/article/view/437.