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"If chiropractors really wanted to understand the risks [of chiropractic neck adjustments] and minimize them, here's what they could do. They could establish a database of every patient who received neck manipulations, listing their presenting symptoms, specifying exactly which type of neck manipulations were done, and following each patient up with phone calls to determine whether symptoms of stroke had developed after treatment. That would (1) establish the true incidence of stroke following neck adjustments, (2) determine whether strokes were more common with certain specific types of adjustments, and (3) determine whether patients were seeking "inappropriate" care for pre-existing symptoms of CAD. This could be done at little expense and would answer clinically significant questions." Article by Harriet Hall, MD, Science Based Medicine (10th February 2009)