In 2004, Cambodia, a low-income country, undertook a rapid scale-up of free antiretroviral therapy (ART) through the public sector in order to respond to the need for treatment for those living with HIV/AIDS. A cohort of patients initiating ART in a provincial national hospital was set up at the beginning of the program to monitor the impact of treatment on patients. Patients provided information on behaviors through face-to-face interviews.
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