RT Journal Article SR Electronic T1 Online-only: New physical activity guidance can reduce risk of breast, colon cancers JF The Nation's Health JO Nations Health FD American Public Health Association SP E11 OP E11 VO 41 IS 3 A1 Johnson, Teddi Dineley YR 2011 UL http://www.thenationshealth.org/content/41/3/E11.abstract AB