History description 2014-03-26: Lock all vaue sets untouched since 2014-03-26 to trackingId 2014T1_2014_03_26
description:
A qualitative measure of the degree of exposure to the causative agent. This includes
concepts such as "low", "medium" and "high". This quantifies how the quantity that
was available to be administered to the target differs from typical or background
levels of the substance.
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