This is the ValueSet that contains all the codes in eHDSI Allergen No Drug (http://terminology.ehdsi.eu/ValueSet/eHDSIAllergenNoDrug) and eHDSI Allergen No Drug (http://terminology.ehdsi.eu/ValueSet/eHDSIAllergenNoDrug). E.g. what you have to deal with if you get resources containing codes in either of them