==External links== 
 External links on Wikipedia are supposed to be "encyclopedic in nature" and useful to a worldwide audience.  Please read the external links policy (and perhaps the specific rules for medicine-related articles) before adding more external links.   

 The following kinds of links are inappropriate: 

 *  Online discussion groups or chat forums 
 *  Personal webpages and blogs 
 *  Multiple links to the same website 
 *  Fundraising events or groups 
 *  Websites that are selling things (e.g., books or memberships) 

 I realize that some links are helpful to certain users, but they still do not comply with Wikipedia policy, and therefore must not be included in the article.  There are a lot of links at the end of this article, and it would be appropriate for the regular editors to "audit" them and reduce them to a small list of the most encyclopedic links.