RT Journal Article SR Electronic T1 Q&A with WHO leader David Heymann: Healthier world requires U.S. leadership: Global health advocate highlights infectious disease challenges JF The Nation's Health JO Nations Health FD American Public Health Association SP 11 OP 11 VO 39 IS 2 YR 2009 UL http://www.thenationshealth.org/content/39/2/11.abstract AB