Here is some 'evidence': http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=101041 http://journals.cambridge.org/action/displayAbstract?fr

Here is some 'evidence': http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=101041 http://journals.cambridge.org/action/displayAbstract?fromPag... "The number of reviews indicating that the modern biomedical interventions show either no effect or insufficient evidence is surprisingly high. Intterrater disagreements suggest a surprising degree of subjective interpretation involved in systematic reviews. Where patterns of disagreement emerged between authors and readers, authors tended to be more optimistic in their conclusions than the readers."