f:Observation/f:component extension with URL = 'https://fhir.cognovis.de/dental/StructureDefinition/periodontal-measurement-site': minimum cardinality of 'extension' is 1 extension with URL = 'https://fhir.cognovis.de/dental/StructureDefinition/periodontal-measurement-site': maximum cardinality of 'extension' is 1 extension with URL = 'https://fhir.cognovis.de/dental/StructureDefinition/periodontal-measurement-site': minimum cardinality of 'extension' is 1 extension with URL = 'https://fhir.cognovis.de/dental/StructureDefinition/periodontal-measurement-site': maximum cardinality of 'extension' is 1 extension with URL = 'https://fhir.cognovis.de/dental/StructureDefinition/periodontal-measurement-site': minimum cardinality of 'extension' is 1 extension with URL = 'https://fhir.cognovis.de/dental/StructureDefinition/periodontal-measurement-site': maximum cardinality of 'extension' is 1 extension with URL = 'https://fhir.cognovis.de/dental/StructureDefinition/periodontal-measurement-site': minimum cardinality of 'extension' is 1 extension with URL = 'https://fhir.cognovis.de/dental/StructureDefinition/periodontal-measurement-site': maximum cardinality of 'extension' is 1 extension with URL = 'https://fhir.cognovis.de/dental/StructureDefinition/periodontal-measurement-site': minimum cardinality of 'extension' is 1 extension with URL = 'https://fhir.cognovis.de/dental/StructureDefinition/periodontal-measurement-site': maximum cardinality of 'extension' is 1