$ 0 0 Paul Feldblum, PhD, MSPHSenior Epidemiologist Contraceptive methodsClinical researchEpidemiologyMost-at-risk populations HealthResearchClinical trials design and implementation: HealthClinical trials design and implementation: ResearchEpidemiological studies: HealthEpidemiological studies: ResearchReproductive and sexual healthGlobal research in sexually transmitted infections Paul Feldblum