This is the ValueSet that contains all the codes in ResearchStudyPrimaryPurposeType (http://terminology.hl7.org/ValueSet/research-study-prim-purp-type) and ResearchStudyPrimaryPurposeType (http://terminology.hl7.org/ValueSet/research-study-prim-purp-type). E.g. what you have to deal with if you get resources containing codes in either of them