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The date and time span used to indicate the start and end of the study for a subject. EXAMPLE(S): OTHER NAME(S): NOTE(S): Derived in two parts: The start date is derived from PerformedStudySubjectMilestone.dateRange WHERE PerformedActivity > DefinedActivity.nameCode = \'first intake of agent\' (or other study-specific milestone). The end date is derived from PerformedStudySubjectMilestone.dateRange WHERE PerformedActivity > DefinedActivity.nameCode = \'last intake of agent\' (or other study-specific milestone). These dates are required for all randomized subjects; null for screen failures (if screen failures are submitted).
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