title: Twin zygosity and pre-eclampsia.
mesh_terms: D005260:Female; D006801:Humans; D010298:Parity; D011225:Pre-Eclampsia / Q000453:epidemiology* / Q000209:etiology; D011247:Pregnancy; D011272:Pregnancy, Multiple; D014427:Twins; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic