The crown-rump length in early human pregnancy: a reappraisal.
Mills
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MS
D005314:Embryonic and Fetal Development / Q000502:physiology*; D005260:Female; D005333:Fetus / Q000033:anatomy & histology*; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011272:Pregnancy, Multiple