[1] Univ N Carolina, Chapel Hill, NC USA
[2] Emory Univ, Atlanta, GA 30322 USA
[3] Duke Univ, Med Ctr, Durham, NC USA
[4] Fred Hutchinson Canc Res Ctr, Seattle, WA 98104 USA
[5] NCI, Div Canc Epidemiol & Genet, NIH, Dept Hlth & Human Serv, Bethesda, MD 20892 USA