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Prepared for: Agency for Healthcare Research and Quality (AHRQ) U.S. Department of Health and Human Services 540 Gaither Road Rockville, MD 20850 www.ahrq.gov Investigators:
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Mark Helfand, MD, MPH, FACP
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Director, Oregon Evidence-based Practice Center
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Oregon Health and Science University
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3181 SW Sam Jackson Park Road
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Portland, Oregon 97239
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helfand@ohsu.edu
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Susan Carson, MPH
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Senior Research Associate, Oregon Evidence-based Practice Center
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Oregon Health and Science University
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3181 SW Sam Jackson Park Road
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Portland, Oregon 97239
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carsons@ohsu.edu
AHRQ Publication No. 08-05114-EF-1 June 2008
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