By Harper Michael J.   Moulton Brent R.   Rosenthal Steven   Wasshausen David B.   in The American Economic Review

ISSN:0002-8282|99|2|74-79

American Economic Association‎(2009)‎

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By Hester Kim E.   Harper Michael J.K.   Duffy Diane M.   in Human Reproduction

ISSN:1460-2350|25|2|360-367

Oxford University Press‎(2010)‎

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