Niromanesh, Shirin, Sahar Farzin Moghadam, and Fatemeh Rahimi Sherbaf. “Maternal and Fetal Doppler Blood Flow Velocimetry Changes in the Management of Asymptomatic Preterm Labor With Vaginal Progesterone Tablet”. Acta Medica Iranica 56, no. 6 (June 23, 2018): 398-404. Accessed September 22, 2020. https://acta.tums.ac.ir/index.php/acta/article/view/6886.