Vijayakrishnan M, Nathan N. An ultrasound study of foetal head-perineum distance in term pregnant women to estimate successful vaginal delivery. Int J Reprod Contracept Obstet Gynecol [Internet]. 2025 Dec. 29 [cited 2025 Dec. 30];15(1):266-72. Available from: https://www.ijrcog.org/index.php/ijrcog/article/view/16277