K., S. P.; C. V., S. N. Clinical study of role of ultrasound in first trimester vaginal bleeding. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 9, n. 10, p. 4010–4015, 2020. DOI: 10.18203/2320-1770.ijrcog20204278. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/7926. Acesso em: 25 nov. 2025.