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And actually, I agree with Dematt that the quote about 30 of 43 studies is better.  Eubulides, the quote you give from the source above does not actually state that the efficacy of chiropractic has not been rigorously proven.  It leaves open the possibility, for example, that some people believe it to have been rigorously proven while others do not.  Perhaps it implies that it has been rigorously proven and perhaps it does not, but it doesn't state it, so we shouldn't state it right out either based on that source. ☺   "