I would start by looking at what the Internet Healthcare Coalition has done in this area. " The mission of the Internet Healthcare Coalition is Quality Healthcare Resources on the Internet."

Check them out at out http://www.ihealthcoalition.org./

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Storm A. King    stormking@charter.net

Resources for the study of the psychology of virtual communities :  http://webpages.charter.net/stormking/

The International Society for Mental Health Online :  http://www.ismho.org/

The Association of Internet Researchers :   http://aoir.org/default.html