import { NamedNode } from 'rdf-js';
declare const _default: {
    CaseSeries: NamedNode<"http://schema.org/CaseSeries">;
    CohortStudy: NamedNode<"http://schema.org/CohortStudy">;
    CrossSectional: NamedNode<"http://schema.org/CrossSectional">;
    Longitudinal: NamedNode<"http://schema.org/Longitudinal">;
    Observational: NamedNode<"http://schema.org/Observational">;
    Registry: NamedNode<"http://schema.org/Registry">;
};
export default _default;
export declare type MedicalObservationalStudyDesign = NamedNode<'http://schema.org/CaseSeries'> | NamedNode<'http://schema.org/CohortStudy'> | NamedNode<'http://schema.org/CrossSectional'> | NamedNode<'http://schema.org/Longitudinal'> | NamedNode<'http://schema.org/Observational'> | NamedNode<'http://schema.org/Registry'>;
