BUR, R. et al. Comorbidities and pregnancy complications as determinants of COVID‑19 severity in pregnant women: a retrospective study at a National Maternal Referral Center. Acta Medica Bulgarica, Sofia, Bulgaria, v. 53, n. 1, p. 33–38, 2026. DOI: 10.2478/amb-2026-0041. Disponível em: https://journals.mu-sofia.bg/index.php/amb/article/view/450.. Acesso em: 15 mar. 2026.