title: Nifedipine and ritodrine in the management of preterm labor: a randomized multicenter trial.
authors.forename: R B
authors.initials: RB
authors.lastname: Lewan
authors.forename: C A
authors.initials: CA
authors.lastname: Flynn
mesh_terms: D015982:Bias; D005260:Female; D006801:Humans; D009543:Nifedipine / Q000627:therapeutic use*; D007752:Obstetric Labor, Premature / Q000188:drug therapy*; D011247:Pregnancy; D012107:Research Design / Q000592:standards*; D012312:Ritodrine / Q000627:therapeutic use*; D015149:Tocolytic Agents / Q000627:therapeutic use*
chemical_list: D015149:Tocolytic Agents; D012312:Ritodrine; D009543:Nifedipine