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"Experts and lay people alike can sometimes find it difficult to demarcate the absurd. Here I propose a set of criteria that may be helpful in achieving this in the realm of healthcare: falsifiability, plausibility and some hallmarks of pseudoscience. Applying this method is unlikely to be fool-proof but it might be a valuable aid in discriminating credible from incredible health claims." Commentary by Professor Edzard Ernst, Evidence-based Complementary and Alternative Medicine (February 2009)