Sharma, R., Minhas, S., & Sood, R. (2017). To study the efficacy of digital and transvaginal ultrasonographic measurement of cervical length in asymptomatic high risk women at POG 16-24 weeks as a predictor of preterm delivery and progesterone and cerclage vs. progesterone alone for short cervical length in prevention of preterm labour. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 4(1), 146–151. Retrieved from https://www.ijrcog.org/index.php/ijrcog/article/view/1826