Noninvasive prenatal screening in twin pregnancies with cell-free DNA using the IONA test: a prospective multicenter study Dahkki Khalil, A, Archer, R, Hutchinson, V, Mousa, HA, Johnstone, ED, Cameron, MJ, Cohen, KE, Ioannou, C, Kelly, B, Reed, K, Hulme, R, Papageorghiou, AT

Cell-free DNA in twin pregnancy: time to change screening recommendations Dahkki Papageorghiou, AT, Hulme, R, Khalil, A, Archer, R, Hutchinson, V, Mousa, HA, Johnstone, ED, Cameron, MJ, Cohen, KE, Ioannou, C, Kelly, B, Reed, K