<status value="draft" /> <experimental value="true" /> <publisher value="NFDI4Health" /> <contact> <telecom> <system value="url" /> <value value="https://www.nfdi4health.de" /> </telecom> </contact> <description value="Value set defining codes to specify the time perspective of a study in a ResearchStudy resource." /> <compose> <include> <system value="http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl" /> <concept> <code value="C53312" /> <display value="Retrospective Study" /> </concept> <concept> <code value="C142646" /> <display value="Prospective Study" /> </concept> <concept> <code value="C53310" /> <display value="Cross-Sectional Study" /> </concept> <concept> <code value="C17649" /> <display value="Other" /> </concept> </include> </compose> </ValueSet>