Vizhñay Ramón, Paola Estefania, and Cristobal Espinoza. “Breast Cancer Risk Factors: A Systematic Review and Meta-Analysis of Observational Studies”. Killkana Salud y Bienestar 9, no. 3 (October 20, 2025): 13–27. Accessed November 14, 2026. https://killkana.ucacue.edu.ec/index.php/killcana_salud/article/view/1572.