This finding supports the results of these retrospective analyses of the characteristics of blastocysts from over 4,000 single blastocyst transfers, which indicate that the stage of blastocyst expansion and trophectoderm grading are highly significant, independent predictors of clinical pregnancy and live birth in fresh cycles ( 24 , 25 ).
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Determining Factors Affecting the Successful Outcome of Fresh Embryo Transfer During In Vitro Fertilization: A Retrospective Cohort Study.
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