I think the sentence itself should be rewritten in a way that s more inline with available sources The evidence for skepticism being widely applyied to empirical skepticism can be seen with a web search or a review of the sites and organizations which rally around this cause Skeptic s Dictionary Skeptical Enquirer etc but I ve been unable to find a source that explicitly claims this so this might fall under original research I am the one who originally added the sentence so someone else should probably reword it