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SCREENING: Mammography rates for Marin white women over 50 dipped from 2001 to 2003, gradually rising to 93 percent by 2012. The peak in 2003 explains a concurrent dip in breast cancer incidence rates. Marin women are still screened much more than the average Californian.   Peter Byrne

As fears of a Marin-centric breast cancer epidemic among educated, high-income white women spread in the late 1990s, the Marin County Department of Health and Human Services assigned its maternal and child health care coordinator, Rochelle Ereman, to direct its epidemiological response to the problem.

Ms. Ereman has a master’s degree in public health . . .