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"The validity of chiropractors' X-ray diagnoses is not well established. Small vertebral displacements or malalignments have no proven clinical relevance, dynamic studies have no proven value, and plain radiographs yield little relevant biomechanical information… In conclusion, the current, albeit incomplete, data suggest an overuse of spinal radiography by the chiropractic profession." E. Ernst, MD, PhD, The British Journal of Radiology [pdf]