Nguyen THT, Vu VT, Nguyen VQH. Prevention of preterm birth among singleton pregnant women with an obtuse uterocervical angle: a quasi-experimental study on the value of cervical pessary combined with progesterone. HUEJMP [Internet]. 30 Tháng Tám 2025 [cited 21 Tháng Chín 2025];15(4):139-47. Available at: https://huejmp.vn/index.php/journal/article/view/653