f:PractitionerRole extension with URL = 'https://fhir.cognovis.de/praxis/StructureDefinition/sitz-anteil': maximum cardinality of 'extension' is 1 extension with URL = 'https://fhir.cognovis.de/praxis/StructureDefinition/stunden-pro-woche': maximum cardinality of 'extension' is 1 extension with URL = 'https://fhir.cognovis.de/praxis/StructureDefinition/arzt-sitz-status': maximum cardinality of 'extension' is 1 specialty: minimum cardinality of 'specialty' is 1