Verma, Suniti, Bhanwar Singh Meena, Pooja Pooja, and Ram Narain Sehra. 2017. “A Study of Cervical Length Measured Ultrasonographically in Prediction of Preterm Delivery”. Obs Gyne Review: Journal of Obstetric and Gynecology 3 (4), 38-43. https://doi.org/10.17511/joog.2017.i04.02.