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Photo of a woman receiving a mammogram by BSIP/UIG via Getty Images. When it comes to mammograms, Candace Furlong is about as well-informed as a patient can get. She's a nurse practitioner. She's a regular reader of medical journals.

Authorities are wrestling to understand what drove Adam Lanza to commit the unthinkable massacre of 20 children and their guardians. While details of his mental state are still unclear, many have said that Lanza may have suffered from a mental…