DR. RICHA YADAV. ROLE OF SALIVARY ESTRIOL TO PROGESTERONE RATIO IN PREDICTION OF PRETERM LABOUR. International Journal of Medical Science And Diagnosis Research, [S. l.], v. 3, n. 10, 2019. Disponível em: https://www.ijmsdr.com/index.php/ijmsdr/article/view/500. Acesso em: 8 may. 2026.