PURBA, Erwin. The Salivary Estriol Level was Higher in Preterm Delivery Compared to that in Preterm Pregnancy. Indonesian Journal of Obstetrics and Gynecology, [S. l.], v. 36, n. 2, p. 66–70, 2012. DOI: 10.32771/inajog.v36i2.289. Disponível em: https://inajog.com/index.php/journal/article/view/289. Acesso em: 16 mar. 2026.