Introduction

• Efficacy of ART is dependent on consistent adherence^{[Bangsberg 2007; Mannheimer 2002; Lima 2010]}
• Maintaining drug exposure at therapeutic levels is necessary to achieve durable virologic suppression, limit risk of resistance, and preserve treatment options^{[Bangsberg 2008; Gardner 2009]}
• Sustaining adequate levels of adherence to ART is challenging^{[Sabate 2003; Lima 2009]}
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