This is the ValueSet that contains all the codes in ICVP - Vaccine Codes (http://smart.who.int/icvp/ValueSet/ICVPVaccineCodes) and ICVP - Vaccine Codes (http://smart.who.int/icvp/ValueSet/ICVPVaccineCodes). E.g. what you have to deal with if you get resources containing codes in either of them