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"The largest professional associations in the United States and Canada distribute patient brochures that make claims for the clinical art of chiropractic that are not currently justified by available scientific evidence or that are intrinsically untestable. These assertions are self-defeating because they reinforce an image of the chiropractic profession as functioning outside the boundaries of scientific behavior." Grod JP, Sikorski D, Keating JC Jr, Journal of Manipulative and Physiological Therapeutics (2001)