To investigate the ratio of Crown to Chin length (CCL) to Crown–rump length (CRL) between triploid and normal fetuses at first trimester and establish a reference range of fetal CCL/CRL… Click to show full abstract
To investigate the ratio of Crown to Chin length (CCL) to Crown–rump length (CRL) between triploid and normal fetuses at first trimester and establish a reference range of fetal CCL/CRL ratio.
               
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