This is the ValueSet that contains codes in both CH AllergyIntolerance Reaction Substance (http://fhir.ch/ig/ch-allergyintolerance/ValueSet/CHAllergyIntoleranceReactionSubstanceValueSet) and CH AllergyIntolerance Reaction Substance (http://fhir.ch/ig/ch-allergyintolerance/ValueSet/CHAllergyIntoleranceReactionSubstanceValueSet).