1.
Pei Ma, Xiaoliu Shao, Ling Liu, Xiang Li, Haiyan Zhang, Lisi Zhang, Yu Liang, Na Li. Meta-analysis of the predictive value of ultrasonic measurement of cervical internal orifice width and cervical length for premature delivery. J Pak Med Assoc [Internet]. 2025 Oct. 4 [cited 2026 Jul. 7];75(7 (July) (Supple-02):S-152. Available from: https://jpma.org.pk/index.php/public_html/article/view/33032