Scripps Health cardiologist Eric Topol says testing for single genetic variants may be misleading, as there are likely to be numerous genes that affect the risk of heart disease, diabetes and other serious illnesses.

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The map "took the 3 billion DNA letters and divided them into 300, 000 ZIP codes so you could locate things, " says cardiologist Eric Topol of Scripps Health.

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The study's good design "provides a basis to infer cause and effect" between poverty and bad health, said Dr. Robert Califf, a noted Duke University cardiologist who is leading a massive study on neighborhoods and health outcomes.

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Paul Thompson, a spectator who is a sports cardiologist, has researched and published extensively about the health implications of running the Boston Marathon.

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"People should be getting nutrition from real foods, not from foods that are artificially modified to give supposed health benefits, " says University of Wisconsin cardiologist James Stein.

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Brown explains that one of the doctors who came to assess prisoner health at the camp happened to be a pediatric cardiologist.

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Paul Thompson, a spectator who is a sports cardiologist, has made a career out of researching and writing about the health implications of running the Boston Marathon.

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As a sports cardiologist, Paul Thompson has made a career out of researching and writing about the health implications of running the Boston Marathon.

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"The biggest problem I see with these clubs is that people participate in them without having made sure from a health perspective that it's clear sailing, " says Dr. David Frid, a cardiologist at the Cleveland Clinic.

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