title: Hormonal contraception and HIV risk: evaluating marginal-structural-model assumptions.
authors.forename: Pai-Lien
authors.initials: PL
authors.lastname: Chen
authors.forename: Stephen R
authors.initials: SR
authors.lastname: Cole
authors.forename: Charles S
authors.initials: CS
authors.lastname: Morrison
mesh_terms: D003271:Contraceptive Agents, Female / Q000009:adverse effects*; D003278:Contraceptives, Oral, Hormonal / Q000009:adverse effects*; D003627:Data Interpretation, Statistical; D003692:Delayed-Action Preparations; D015658:HIV Infections / Q000453:epidemiology* / Q000209:etiology; D006801:Humans; D017258:Medroxyprogesterone Acetate / Q000009:adverse effects*; D015233:Models, Statistical; D012307:Risk Factors
chemical_list: D003271:Contraceptive Agents, Female; D003278:Contraceptives, Oral, Hormonal; D003692:Delayed-Action Preparations; D017258:Medroxyprogesterone Acetate