Ho, Ka Wun Karen, Chun Kit Wong, Man Wai Catherine Hung, and Wai Lam Lau. “Transperineal Ultrasound Measurement of Cervical Length to Predict Preterm Delivery in Women With Threatened Preterm Labour”. Hong Kong Journal of Gynaecology, Obstetrics and Midwifery 24, no. 1 (December 5, 2023). Accessed November 23, 2024. https://hkjgom.org/home/article/view/354.