By Ning Y.   Williams M.A.   Butler C.L.   Muy-Rivera M.   Frederick I.O.   Sorensen T.K.   in Human Reproduction

ISSN:1460-2350|20|2|382-389

Oxford University Press‎(2005)‎

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By Ning Y.   Williams M. A.   Muy-Rivera M.   Leisenring W. M.   Luthy D. A.   in Journal of Maternal-Fetal and Neonatal Medicine

ISSN:1476-4954|15|3|186-192

Informa Healthcare‎(2004)‎

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