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| Imperfect placebos are common in low back pain trials: a systematic review of the literature | 
| Machado LAC, Kamper SJ, Herbert RD, Maher CG, McAuley JH | 
| European Spine Journal 2008 Jul;17(7):889-904 | 
| systematic review | 
| Copyright release for this abstract has not been granted. 
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