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When defining an acronym, only capitalize proper nouns such as organizations, brands, questionnaires, etc. or use the specific capitalization given for that acronym by the people who created it (e.g. AMSTAR A MeaSurement Tool to Assess systematic Reviews)
Common terms do not get capitalization, even the first word as this is not sentence case, it is an acronym followed by the word it represents).
BP blood pressure
MAS Modified Ashworth Scale
SCI spinal cord injury