Query: When was my last flu vaccination?, FHIR Resource: {'resourceType': 'Procedure', 'status': 'completed', 'category': None, 'code': {'coding': [{'system': 'http://snomed.info/sct', 'version': 'http://snomed.info/sct/731000124108', 'code': '454711000124102', 'display': 'Depression screening using Patient Health Questionnaire Two-Item score (procedure)'}], 'text': 'Depression screening using Patient Health Questionnaire Two-Item score (procedure)'}, 'subject': {'reference': 'urn:uuid:514d3cd5-9d59-c1c1-9457-aad183a74c4f'}, 'performedDateTime': None}