PIRIYEV, E.; ROMER, T. Pregnancy while using a levonorgestrel-releasing intrauterine system 52 mg: a case report. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 9, n. 11, p. 4692–4694, 2020. DOI: 10.18203/2320-1770.ijrcog20204835. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/9091. Acesso em: 4 oct. 2025.