Tirado Otálvaro, Andrés Felipe, and Claudia Marcela Moreno Uribe. 2007. “Associated Factors to Low Vaccination Rates in Santa Bárbara (Antioquia) 2005 - 2006”. Medicina UPB 26 (1): 33-42. https://revistas.upb.edu.co/index.php/medicina/article/view/2311.