History description 2014-03-26: Lock all vaue sets untouched since 2014-03-26 to trackingId 2014T1_2014_03_26
description:
Regions of Interest (ROI) within a subject Act. Primarily used for making secondary
observations on a subset of a subject observation. The relationship between a ROI
and its referenced Act is specified through an ActRelationship of type "subject" (SUBJ),
which must always be present.
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