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Level 5 evidence leaves implications open; higher-quality trials needed before any practice consideration.
The University of Western Ontario London, ON, Canada. Address requests for reprints to: William J. Sibbald, MD, Department of Medicine, London Health Sciences Centre, South Street Campus, 375 South Street, Room N481, London, ON N6A 4G5, Canada.
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Sibbald et al. (1997) studied this question.
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