You can get abstracts from the U.S. National Institutes of Health,
National Medical Library using their search engine, Internet Grateful Med
at http://igm.nlm.nih.gov/
Full text articles from some journals are available on line. The only
single source I know of, and it's not comprehensive, is the British
Medical Journal site at http://www.bjm.com In truth, I've not tried to
get full text articles from them, just noted that they had begun open
posting of a number of journals.
The U.S. National Institutes of Health has an electronic journal web
site, but I don't know if anything is posted there yet. I think
everyone's still arguing about how to make money off free access. There
might be info at http://www.nih.gov/welcome/director/ebiomed/ebiomed.htm,
or some other nih page.
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