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To evaluate the literature on the effectiveness of bed and wheelchair positioning and repositioning in the prevention of pressure ulcers (PUs) in both the spinal cord injury (SCI) and non-SCI populations.Systematic review.PubMed, CINAHL, PsycINFO, and EMBASE were queried with the subject heading terms “pressure sore,” “pressure ulcer,” “position or turn in bed, wheelchair,” “pressure relief,” and...