This is the ValueSet that contains all the codes in Toxicity Severity (http://hl7.eu/fhir/ig/pcsp/ValueSet/toxicityseverity-vs) and Toxicity Severity (http://hl7.eu/fhir/ig/pcsp/ValueSet/toxicityseverity-vs). E.g. what you have to deal with if you get resources containing codes in either of them