RT Journal Article SR Electronic T1 Online-only: U.S. traffic deaths drop to lowest level since 1949 JF The Nation's Health JO Nations Health FD American Public Health Association SP E17 OP E17 VO 41 IS 4 A1 Teddi Dineley Johnson YR 2011 UL http://www.thenationshealth.org/content/41/4/E17.abstract AB