observation
OtherParticipants will have biomedical information extracted from their medical chart, will complete the ACASI questionnaire and have a face-to-face post-ACASI debriefing interview administered. Participants who do not have a documented HIV-1 viral load and/or CD4+ T-cells count from within the previous six months will also have venipuncture performed to obtain a blood sample for these tests to be performed.