Isaza, Carolina, David Martina, Jorge Estupiñan, Carlos Starck, and Humberto Rey. “Prevalence of Congenital Malformations Diagnosed in the First 24 Hours of Life”. Colombia Medica 20, no. 4 (December 31, 1989): 156–159. Accessed December 7, 2025. http://colombiamedica.univalle.edu.co/index.php/comedica/article/view/6272.