This lag and the shortage of H1N1 vaccine have focused attention on the status of government efforts to develop state-of-the-art techniques to make flu and other vaccines, and the nation's dependence on a process that is notoriously slow and unreliable.
Kay Dickersin, a breast cancer survivor and director of the U.S. Cochrane Center and the Center for Clinical Trials at the Johns Hopkins Bloomberg School of Public Health, answers questions about the new mammography guidelines.
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