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STUDYID, DOMAIN, and --SEQ are required in all domains based on one of the 3 general observation classes. Each general class domain must also include at least 1 of the following subject identifiers: USUBJID, SPDEVIDSPDEVID, POOLID, SPTOBID, or POOLIDGTREFID (in the GT domain only).
All identifier variables are allowed for any domain based on one of the 3 general observation classes, unless otherwise noted in the Usage Restrictions.
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