1. Estimations of gestational age and screening for Down's syndrome;Holding, S.;BMJ,1991
2. Estimations of gestational age and screening for Down's syndrome. B;M_J,1991
3. Reducing the psychological costs;Marteau, T.;BMJ,1990
4. Anxiety during a crisis: emotional effects of screening for neural tube defects;Robinson, J.O.; Hibbard, B.M.; Laurence, K.M.;7 Psychosom Res,1984
5. Maternal serum screening for Down's syndrome in early pregnancy;Wald, N.J.; Cuckle, H.S.; Densem, J.W.; Nanchahal, K.; Royston, P.; Chard, T.;BMJ,1988