Maria Fabrizio for NPR

Electronic Health Records May Help Customize Medical Treatments

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Studies show that having too many tests done too frequently is a recipe for getting sick, not staying healthy. Medicimage/Science Source hide caption

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Medicimage/Science Source

Whether or not you'll someday get cancer or any disease can feel like a roll of hundreds of dice. Calculating the odds --€” and knowing what they mean --€” is tricky. Katie Harbath/Flickr hide caption

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Katie Harbath/Flickr