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A universally unique identifier (UUID) is a 128-bit label used for information in computer systems. The term globally unique identifier (GUID) is also used.
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- https://clinicaltrials.gov/ct2/show/NCT12345678 (refereing to referring to a study registry reference)
- http://snomed.info/ns/concept/24762387 (refering to referring to an external concept in the SNOMED vocabulary)
- https://loinc.org/78200-3/ (refering to referring to an external concept in the LOINC vocabulary)
The preference is to use persistent URIs for these contexts (ie URIs i.e. URIs that should exist so any future references can be followed and understood).
NOTE: when using these concepts in an evaluable context, the preferred recommended approach is to use the the Coding Element.
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