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"Members of the National Upper Cervical Chiropractic Association (NUCCA) specialize in adjustment of the atlas, using the procedure as an exclusive treatment for a great variety of ailments…The NUCCA approach to treating human ailments received unexpected support recently when a pilot study published in a legitimate medical journal suggested that correcting atlas misalignment would reduce early high blood pressure…The minor atlas subluxations routinely found by NUCCA chiropractors have not been proven to be significant. I would be surprised if a legitimate properly controlled study offered proof that upper neck manipulation would permanently lower blood pressure that has an organic origin. The claim by NUCCA practitioners that a painless slightly misaligned atlas is a cause of high blood pressure does not have enough supporting evidence to warrant the risk of manipulating the necks of patients suffering from high blood pressure, risking injury to vertebrobasilar arteries." Article by Sam Homola, DC, Science Based Medicine (7th August 2009)