title: Letter: Studies on amniotic liquor in predicting maturity of twin pregnancies.
mesh_terms: D000653:Amniotic Fluid; D005260:Female; D005333:Fetus / Q000502:physiology*; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011272:Pregnancy, Multiple; D013997:Time Factors; D014427:Twins