This is the ValueSet that contains all the codes in Adverse Event Clinical Research Seriousness Criteria (http://terminology.hl7.org/ValueSet/adverse-event-clinical-research-seriousness-criteria) and Adverse Event Clinical Research Seriousness Criteria (http://terminology.hl7.org/ValueSet/adverse-event-clinical-research-seriousness-criteria). E.g. what you have to deal with if you get resources containing codes in either of them