Mammogram centers must now inform women about their breast density. Here's how it could affect you The Associated PressBreast Cancer Awareness Month: Joan Lunden reflects 10 years after beating disease, urges women to be aware of breast density ABC7 ChicagoDense breasts can make it harder to spot cancer on a mammogram goskagit.comMammograms aren't always enough: One woman's journey highlights importance of dense breast screening CBS News