A trial too far?
D005260:Female; D006801:Humans; D015337:Multicenter Studies as Topic; D007752:Obstetric Labor, Premature / Q000382:microbiology*; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000209:etiology*; D016032:Randomized Controlled Trials as Topic; D012307:Risk Factors