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Bronfort G, Maiers MJ, Evans RL, Schulz CA, Bracha Y, Svendsen KH, Grimm RH Jr, Owens EF Jr, Garvey TA, Transfeldt EE.Bronfort G, et al.Spine J. 2011 Jul;11(7):585-98. doi: 10.1016/j.spinee.2011.01.036. Epub 2011 May 31.Spine J. 2011.PMID: 21622028Clinical Trial.