---
type: "sdc-page"
title: "SDC: StructureDefinition-sdc-questionnaire-observationLinkPeriod-intro"
source: "sdc/input/pagecontent/StructureDefinition-sdc-questionnaire-observationLinkPeriod-intro.xml"
---
# SDC: StructureDefinition-sdc-questionnaire-observationLinkPeriod-intro

Additional details on the use of this extension can be found on the [Questionnaire Population](/sdc-populate#observation-based-population) page.