This is the ValueSet that contains all the codes in Time Quantity Unit Codes (http://fhir.ch/ig/ch-emed-epr/ValueSet/ch-emed-epr-time-quantity-unit-code) and Time Quantity Unit Codes (http://fhir.ch/ig/ch-emed-epr/ValueSet/ch-emed-epr-time-quantity-unit-code). E.g. what you have to deal with if you get resources containing codes in either of them