http://hl7.org/fhir/StructureDefinition/devicerequest-patientInstruction|5.2.0

Simple concise instructions to be read by the patient. For example “twice a day” rather than “BID.”.

Name	Card	Type	Description & Constraints
Extension	0..*		Patient Friendly Instructions
extension *	1..1	Extension	Language
extension	?..0
url	?..?	uri
value[x] *	1..?		Language (preferred)
valueCode *	1..?	code	Language (preferred)
extension *	1..1	Extension	Text
extension	?..0
url	?..?	uri
value[x] *	1..?
valueString *	1..?	string
url	?..?
value[x]	0..0