Another retrospective analysis of the characteristics of blastocysts from 3,151 IVF cycles indicated that trophectoderm grading and blastocyst expansion stage are highly significant independent predictors of clinical pregnancy ( 31 ).
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Determining Factors Influencing The Successful Embryo Transfer and Pregnancy during The Frozen Cycle of <i>In Vitro</i> Fertilization: A Retrospective Cohort Study.
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