title: Reduced risk of pelvic inflammatory disease with injectable contraceptives.
authors.forename: R H
authors.initials: RH
authors.lastname: Gray
mesh_terms: D003271:Contraceptive Agents, Female / Q000008:administration & dosage* / Q000009:adverse effects; D005260:Female; D006801:Humans; D007267:Injections; D000292:Pelvic Inflammatory Disease / Q000139:chemically induced / Q000517:prevention & control*; D012306:Risk
chemical_list: D003271:Contraceptive Agents, Female