Doc, I've Been Looking at Some Web Sites--So What Should I Believe?  

Because anyone, from nationally renowned physicians to your next-door neighbor, can post health information online, readers need to be selective when taking advice from medical web sites. Several non-profit and government agencies have developed guidelines to help readers as they evaluate health and medical information online. Some researchers have also begun to study the ways that readers actually judge the credibility of web sites. Recommendations from heuristic guidelines and recent empirical research have been distilled into a list of guidelines for writers and editors.

Freeman, Krisandra S. STC Proceedings (2002). Articles>Education>Biomedical>Online