β€œIs the Use of Combined Oral Contraceptives in the Postpartum Period As Safe As the Use of Oral Progestins?”. Portuguese Journal of Family Medicine and General Practice 25, no. 1 (January 1, 2009): 31–6. Accessed April 17, 2026. https://rpmgf.pt/ojs/index.php/rpmgf/article/view/10587.