This is the ValueSet that contains all the codes in WHO GDHCN Key Usage ValueSet - DEV (http://smart.who.int/trust/ValueSet/KeyUsage-DEV) and WHO GDHCN Key Usage ValueSet - DEV (http://smart.who.int/trust/ValueSet/KeyUsage-DEV). E.g. what you have to deal with if you get resources containing codes in either of them