When I'm looking for a sub-topic, I often start at About.com. About.com is arguably one of the Internet's real "content kings," About.com functions essentially as an authoritative blog on steroids. About.com covers a broad range of topics and sub-topics, thus they were my first stop in attempting to locate high quality preventive medicine feed.
As anyone who runs the above search can see, even the "content kings" don't have a pre-packaged solution for us.
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