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Evans M.I., Chik L., O'brien J.E., Chen B., Dvorin E., Ayoub M., Krivchenia E.L., Ager J.W., Johnson M.P., Sokol R.J., MOMs and DADs: Improved specificity and cost effectiveness of biochemical screening for aneuploi-dy with DADs, Am J Obstet Gynecol, 172, pp. 1138-1147, (1995)
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Wald N., Cuckle H., Wu T.S., George L., Maternal serum unconjugatcd es-triol and human chorionic gonadotropin levels in twin pregnancies: Implications for screening for Down's syndrome, Br J Obstet Gynaecol, 98, pp. 905-908, (1991)