Research article

Differences in reproductive risk factors for breast cancer in middle-aged women in Marin County, California and a sociodemographically similar area of Northern California

C Suzanne Lea¹^*, Nancy P Gordon², Lee A Prebil³, Rochelle Ereman³, Connie S Uratsu² and Mark Powell³

¹ Department of Public Health, Brody School of Medicine, East Carolina University, Greenville, NC 27834, USA

² Kaiser Permanente Division of Research, 2000 Broadway, Oakland, CA 94612, USA

³ Marin County, Department of Health and Human Services, 20 North San Pedro Road, Suite 2002, San Rafael, CA 94903, USA

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BMC Women's Health 2009, 9:6 doi:10.1186/1472-6874-9-6

Published: 25 March 2009

Additional file 1:

Survey questionnaire used for the study.

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