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"The UK General Chiropractic Council has commissioned a survey of chiropractic patients' views of chiropractic...Perhaps the most remarkable finding from the report is the unwillingness of chiropractors to co-operate with the GCC which, after all, is their regulating body. To recruit only ~10% of all UK chiropractors is more than disappointing. This low response rate will inevitably impact on the validity of the results and the conclusions. It can be assumed that those practitioners who did volunteer are a self-selected sample and thus not representative of the UK chiropractic profession; they might be especially good, correct or obedient. This, in turn, also applies to the sample of patients recruited for this research. If that is so, the picture that emerged from the survey is likely to be far too positive. In any case, with a response rate of only ~10%, any survey is next to useless. I would therefore put it in the category of 'not worth the paper it is printed on'." Professor Edzard Ernst (15th February 2013)