The Komen Web site cites a meta-analysis of the the two largest randomized controlled trials, one from China and one from Russia.

CNN: Breast 'awareness' trumps self-exams, docs say

He theorized that just as the credibility of an academic work is often weighted by the number and diversity of other works it cites, the importance of any given Web page could also be determined by the number of other pages to which it is linked.

FORBES: How Google Refined the Entrepreneurial Spirit by Applying Strategic Focus to Invent a New Industry