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Behavioral Risk Factor Surveillance System (BRFSS):
http://www.cdc.gov/nccdphp/brfss/

Questions and prevalence data on women's health in BRFSS
http://www2.cdc.gov/nccdphp/brfss/page.asp?cat=WH&yr=1999&state=US#WH

Trend data on number of mamagrams within 2 years in BRFSS
http://198.246.97.130/brfss/Trends/trendchart.asp?qkey=10060&state=US