C49637Level 5

Reference Period

**Semantic type:** Temporal Concept

**Definition:** A time frame that is of value for its relationship to a notable event.

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C129696Since Beginning Study Agent

C49638Relation to Reference Period

C82557End Relative to Reference Period

C82558End Relative to Reference Time Point

C82559Start Relative to Reference Period

C82560Start Relative to Reference Time Point

C92489Length of Time between Product Exposure and Onset of Adverse Event Symptom

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