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Maternal age and serum concentration of human chorionic gonadotropin in early pregnancy - Haavaldsen - 2014 - Acta Obstetricia et Gynecologica Scandinavica - Wiley Online Library
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Association between 7-day serum β-hCG levels after frozen–thawed embryo transfer and pregnancy outcomes: a single-centre retrospective study from China | BMJ Open
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Maternal age and serum concentration of human chorionic gonadotropin in early pregnancy - Haavaldsen - 2014 - Acta Obstetricia et Gynecologica Scandinavica - Wiley Online Library
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