Mohammad, R., M. Zargar, M. Barati, and S. Ershadian. “The Comparison of Predictive Value of Cervical Length in Singleton Spontaneous Preterm Labor With in Vitro Fertilization Pregnancies: A Cohort Study”. International Journal of Reproductive BioMedicine (IJRM), Vol. 19, no. 1, Jan. 2021, pp. 57–62, doi:10.18502/ijrm.v19i1.8180.