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Smeets RJ, Wittink H, Hidding A, Knottnerus JA.Smeets RJ, et al. Among authors: wittink h.Spine (Phila Pa 1976). 2006 Jan 1;31(1):90-7; discussion 98. doi: 10.1097/01.brs.0000192641.22003.83.Spine (Phila Pa 1976). 2006.PMID: 16395183
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