[1] NCI, Div Canc Epidemiol & Genet, NIH, Bethesda, MD 20892 USA
[2] Univ Alabama Birmingham, Sch Med, Dept Med, Div Prevent Med, Birmingham, AL USA
[3] Univ Alabama Birmingham, ONeal Comprehens Canc Ctr UAB, Birmingham, AL USA
[4] Natl Inst Minor Hlth & Hlth Dispar, Div Intramural Res, NIH, Bethesda, MD USA