[1] NCI, Basic Res Program, Frederick, MD 21701 USA
[2] Johns Hopkins Univ, Bloomberg Sch Publ Hlth, Dept Epidemiol, Baltimore, MD USA
[3] Johns Hopkins Univ, Sch Med, Div Infect Dis, Baltimore, MD USA
[4] New York Acad Med, Ctr Urban Epidemiol Studies, New York, NY USA
[5] NCI, Lab Genomic Divers, NIH, Frederick, MD 21701 USA