%0 Journal Article %A Imran Rafi %A Melissa Hill %A Judith Hayward %A Lyn S Chitty %T Non-invasive prenatal testing: use of cell-free fetal DNA in Down syndrome screening %D 2017 %R 10.3399/bjgp17X691625 %J British Journal of General Practice %P 298-299 %V 67 %N 660 %U https://bjgp.org/content/bjgp/67/660/298.full.pdf