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Lippincott, Williams & Wilkins, Obstetrical & Gynecological Survey, 6(63), p. 361-363, 2008

DOI: 10.1097/01.ogx.0000316305.61461.6f

Massachusetts Medical Society, New England Journal of Medicine, 7(358), p. 667-675

DOI: 10.1056/nejmoa075974

Elsevier, Year Book of Pediatrics, (2009), p. 374-375

DOI: 10.1016/s0084-3954(08)79060-2

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