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"The association between chiropractic neck manipulation and vascular accidents is well established. A recent case control study, however, casts doubt on the notion that the association is caused by nature. A detailed critique of that study reveals several weaknesses. Therefore the balance of probabilities seems to indicate that the association, in fact, is causal." Professor Edzard Ernst, review and opinion published in Perfusion (February 2010) [pdf]
Professor Ernst defends himself against accusations of bias, particularly relating to his critical assessments of chiropractic, in this January 2011 interview with On The Other Hand podcast host and chiropractor, Brett Kinsler. [Transcript.]