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A timeframe (referred to as a reference period) and , fixed points in time, and other milestones (referred to as reference time points), may be defined in the context of a study as references to which the timing of other collected observations are related. The is related. In the context of this guide, such timeframes are referred to as reference periods and such fixed points in time and milestones are referred to as reference time points. The following will be collected using TIG Collection or CDASH Model Timing fields when references for the timing of other observations are defined:

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