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Comparison of the mean birthweight of neonates who were born by assisted reproductive technology (ART) using frozen‐thawed embryo transfer (FET) in hormone replacement therapy (HRT) cycles or ovulatory (OVL) cycles and neonates without ART. The birthweight is shown for each gestational week. a vs b, P < .01; c vs d, P < .05. NTR, natural pregnancy
