omeone will accidentally use test data without realizing it is test data. 
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<a name="privacy-of-ids"></a>
<h4>Risks to Privacy by Exposing Links</h4>
<p>
Use-Case: There are times when data will have different authorization requirements. Where some data must be restricted to a smaller subset of the audience that has access to other data. Such as sensitive health topics within a patient compartment.
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  <em>Trigger:</em> When data are exposed that has links (e.g., Reference) to other data that th