33. REVIEW OF THE PREDICTIVE VALUE OF CERVICAL LENGTH AND CERVICAL ANGLE ON ULTRASOUND FROM WEEK 22-28 IN SINGLE PREGNANT WOMEN AT NINH BINH OBSTETRICS AND PEDIATRIC HOSPITAL IN 2024. Vietnam Journal of Community Medicine, v. 66, n. CĐ6-HNKH Bệnh viện Sản nhi Nghệ An, 31 May2025.