This is the ValueSet that contains all the codes in Triggers or Exacerbating Factor Codes (http://hl7.org/fhir/uv/symptoms/ValueSet/TriggersOrExacerbatingFactorCodes) and Triggers or Exacerbating Factor Codes (http://hl7.org/fhir/uv/symptoms/ValueSet/TriggersOrExacerbatingFactorCodes). E.g. what you have to deal with if you get resources containing codes in either of them