Plasma antiretroviral drug concentrations
Antiretroviral drug concentrations in plasma were determined at BioXpedia using liquid chromatography with tandem mass spectrometry (LC–MS/MS) assay for individuals not fulfilling the criteria for viral rebound at week 13. Two timepoints were analyzed: (1) week 0 and (2) end of study, defined as the timepoint for reaching criteria for viral rebound or week 25, whichever came first.