Chúa, Carlos. “Exist a Stational Trends in Neural Tube Defects in Guatemala?”. Revista médica (Colegio de Médicos y Cirujanos de Guatemala) 156, no. 2 (December 30, 2017): 54–60. Accessed November 7, 2026. https://archive.revistamedicagt.org/index.php/RevMedGuatemala/article/view/56.