This is the ValueSet that contains all the codes in Chemotherapy cumulative dose units (http://hl7.eu/fhir/ig/pcsp/ValueSet/ChemoUnitsVs) and Chemotherapy cumulative dose units (http://hl7.eu/fhir/ig/pcsp/ValueSet/ChemoUnitsVs). E.g. what you have to deal with if you get resources containing codes in either of them