And actually I agree with Dematt that the quote about  of  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 doesnt state it so we shouldnt state it right out either based on that source