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14. Absence of need for amniocentesis in patients with elevated levels of maternal serum alpha-fetoprotein and normal ultrasonographic examinations. Nadel AS, Green JK, Holmes LB, Frigoletto FD, Benacerraf BR. N Engl J Med; 1990 Aug 30; 323(9):557-61. PubMed ID: 1696358 [Abstract] [Full Text] [Related]