title: The source of 17P used in NICHD trial.
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Meis
mesh_terms: D005260:Female; D006801:Humans; D011247:Pregnancy; D047928:Premature Birth / Q000517:prevention & control*; D011374:Progesterone / Q000627:therapeutic use*; D011372:Progestins / Q000627:therapeutic use*
chemical_list: D011372:Progestins; D011374:Progesterone