[1] Univ Alabama, Sch Publ Hlth, Dept Epidemiol, Birmingham, AL 35294 USA
[2] Ctr Dis Control & Prevent, Div HIV AIDS Prevent, Natl Ctr HIV STD & TB Prevent, Atlanta, GA USA
[3] Univ Alabama, Sch Publ Hlth, Dept Biostat, Birmingham, AL 35294 USA
[4] Univ Alabama, Sch Med, Div Infect Dis, Birmingham, AL USA
[5] Univ Alabama, Sch Publ Hlth, Dept Epidemiol, Birmingham, AL 35294 USA
[6] Univ Alabama, Sch Publ Hlth, Dept Maternal & Child Hlth, Birmingham, AL 35294 USA