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Fertility and Sterility > 2012 > 98 > 3 > 520-528
Fertility and Sterility > 2010 > 94 > 6 > 1985-1994
Fertility and Sterility > 2002 > 78 > 4 > 830-835
European Journal of Obstetrics and Gynecology > 2001 > 96 > 1 > 21-34