CHAN, H., K. CHEONG, K. LEUNG, and M. H. TANG. “Trend of Prenatal Invasive Testing and Down’s Syndrome Screening in a Tertiary Referral Centre in Hong Kong”. Hong Kong Journal of Gynaecology, Obstetrics and Midwifery, vol. 9, no. 1, Mar. 2023, doi:10.12809/hkjgom.9.1.90.