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. Journal of the Pakistan Medical Association, [S. l.], v. 75, n. 7 (July) (Supple-02), p. S–152, 2025. DOI: 10.47391/JPMA.SRPH-26. Disponível em: https://mail.jpma.org.pk/index.php/public_html/article/view/33032. Acesso em: 30 may. 2026.