Valdivieso-Monteros, D. M., Méndez-Galarza, E. P., Méndez-Cabrera, S. F., Tapia-Cárdenas, J. P., & Sánchez-Salazar, G. M. (2022). Validity between cervicometry determined by ultrasonography and preterm delivery. CEUS Scientific Journa, 4(3), 1-6. https://ceus.ucacue.edu.ec/index.php/ceus/article/view/133