C. J. Saavedra-Alvarado, A. García-Ruiz, and A. F. Hernández-Ortiz, “Beginning of sexual and reproductive life in adolescence - UPSE Educational Unit”, CEUS, vol. 3, no. 1, pp. 19–24, Apr. 2021, Accessed: Nov. 12, 2026. Available: https://ceus.ucacue.edu.ec/index.php/ceus/article/view/51