Most women should start regular breast cancer screening at age 50, not 40, according to new guidelines released on Monday by the influential U.S. Preventive Services Task Force (USPSTF). The new guidelines have unleashed a heated debate and caused confusion for women and their doctors. International guidelines also call for screening to start at age 50 � the World Health Organization recommends the test every two years, Britain says every three years. Jeb Sharp talks with David Dershaw, Director of Breast Imaging at Memorial Sloan-Kettering Cancer Center.

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