This is the ValueSet that contains all the codes in ARV drug regimen received prior to enrolment ValueSet (http://smart.who.int/hiv/ValueSet/HIV.D.DE64) and ARV drug regimen received prior to enrolment ValueSet (http://smart.who.int/hiv/ValueSet/HIV.D.DE64). E.g. what you have to deal with if you get resources containing codes in either of them