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663 . Ewigman, B.G., J.P. Crane, F.D. Frigoletto, M.L. LeFevre, R.P. Bain, D. McNellisthe RADIUS study group 1993 Effect of prenatal ultrasound screening on perinatal outcome
663 . Ewigman, B.G., J.P. Crane, F.D. Frigoletto, M.L. LeFevre, R.P. Bain, D. McNellisthe RADIUS study group 1993 Effect of prenatal ultrasound screening on perinatal outcome