“Rate of Vaginal Delivery in Relation to the Occiput – Spine Angle and Head – Perineum Distance Measured by Ultrasound During the Second Stage of Labor and Associated Factors at Hung Vuong Hospital” (2026) Tạp chí Y dược học Phạm Ngọc Thạch, 5(4). Available at: https://bsgdtphcm.vn/ojs/index.php/pnt/article/view/203 (Accessed: 1 November 2026).