FILE - In this July 31, 2008 file photo, Centers for Disease Control and Prevention (CDC) Director Julie Gerberding prepares to testify on Capitol Hill in Washington. Gerberding, now president of Merck & Co.'s vaccine unit, commenting on a study about medical salary inequities published Wednesday, June 13, 2012 in the Journal of the American Medical Association, says women tend to be less aggressive at self-promoting than men, a possible reason top women researchers get paid substantially less than their male counterparts. (AP Photo/Susan Walsh, File)

Associated Press
FILE - In this July 31, 2008 file photo, Centers for Disease Control and Prevention (CDC) Director Julie Gerberding prepares to testify on Capitol Hill in Washington. Gerberding, now president of Merck & Co.'s vaccine unit, commenting on a study about medical salary inequities published Wednesday, June 13, 2012 in the Journal of the American Medical Association, says women tend to be less aggressive at self-promoting than men, a possible reason top women researchers get paid substantially less than their male counterparts. (AP Photo/Susan Walsh, File)
FILE - In this July 31, 2008 file photo, Centers for Disease Control and Prevention (CDC) Director Julie Gerberding prepares to testify on Capitol Hill in Washington. Gerberding, now president of Merck & Co.'s vaccine unit, commenting on a study about medical salary inequities published Wednesday, June 13, 2012 in the Journal of the American Medical Association, says women tend to be less aggressive at self-promoting than men, a possible reason top women researchers get paid substantially less than their male counterparts. (AP Photo/Susan Walsh, File)
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