f:DeviceRequest identifier: minimum cardinality of 'identifier' is 1 status: minimum cardinality of 'status' is 1 parameter: minimum cardinality of 'parameter' is 1 authoredOn: minimum cardinality of 'authoredOn' is 1 requester: minimum cardinality of 'requester' is 1 reasonReference: minimum cardinality of 'reasonReference' is 1 insurance: minimum cardinality of 'insurance' is 1