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Levels of adherence by study week for 4 adherence measures: self-report, Wisepill openings, tenofovir concentrations in hair, and tenofovir-diphosphate concentrations in dried blood spots. Estimated number of preexposure prophylaxis doses taken per week are displayed. Abbreviations: TFV, tenofovir; TFV-DP, tenofovir-diphosphate.
