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Additional timing variables can be included for phase, period, and subperiod (APHASE, APERIOD, and ASPER, defined in iin Section 2.9.6.3 Timing Variables for BDS Datasets )
). Section 2.9.5.7, Subject-Level Period, Subperiod, and Phase Timing Variables for ADSL Datasets provides the subject-level variables for these timing elements.
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