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Method Guidelines for Systematic Reviews in the Cochrane Collaboration Back Review Group for Spinal Disorders. van Tulder, Maurits W. PhD *; Assendelft, Willem J. J. MD, PhD *; Koes, Bart W. PhD *; Bouter, Lex M. PhD *; the Editorial Board of the Cochrane Collaboration Back Review Group + [Editorial] Spine. 22(20):2323-2330, October 15, 1997.
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