Imperfect placebos are common in low back pain trials: a systematic review of the literature.
Machado LA; Kamper SJ; Herbert RD; Maher CG; McAuley JH; European Spine Journal: Official Publication Of The European Spine Society, The European Spinal Deformity Society, And The European Section Of The Cervical Spine Research Society, 2008, vol. 17, issue 7, p 889, ISSN 14320932. ISBN 14320932.

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