When does the bag of waters break?
D000328:Adult; D005260:Female; D005322:Premature Rupture of Fetal Membranes / Q000523:psychology; D006266:Health Education / Q000592:standards; D006801:Humans; D007747:Labor Stage, First / Q000523:psychology; D009035:Mothers / Q000193:education* / Q000523:psychology; D011247:Pregnancy; D011322:Primary Prevention / Q000592:standards