CHAN, Viola YT, Wai-Lam LAU, Tsz-Kin LO, and Wing-Cheong LEUNG. 2015. “Comparison of Digital Vaginal Examination With Intrapartum Transabdominal Ultrasound to Determine Fetal Head Position: A Local Experience”. Hong Kong Journal of Gynaecology, Obstetrics and Midwifery 15 (1). https://doi.org/10.12809/hkjgom.15.1.172.