[ 7 , 14 ] A decreasing trend in self-reported use of mammography was observed from 1999 to 2005 in the United States, [ 15 , 16 ] whereas an ascending trend was observed for the screening rate of CRC in the United States from 2000 to 2003.
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Spatial and temporal variations of screening for breast and colorectal cancer in the United States, 2008 to 2012.
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