KHALEF, Adian Thamer. Early In Pregnancy, Serum Activin-A Levels Can Be Used To Differentiate Between An Ectopic Pregnancy And A Normal Intrauterine Pregnancy. Adolescência e Saúde, [S. l.], v. 21, n. 6s, p. 634–639, 2026. DOI: 10.67440/ahj.v21i6s.1666. Disponível em: https://adolescenciaesaude.com/index.php/aes/article/view/1666. Acesso em: 23 aug. 2026.