CHOI, S. S., L. W. CHAN, and W. W. TO. “Pregnant Women’s Attitudes to and Knowledge of Non-Invasive Prenatal Testing in Down Syndrome Screening in Hong Kong”. Hong Kong Journal of Gynaecology, Obstetrics and Midwifery, vol. 14, no. 1, Jan. 2014, doi:10.12809/hkjgom.14.1.156.