[1] Univ N Carolina, Dept Hlth Behav, Gillings Sch Global Publ Hlth, Chapel Hill, NC 27515 USA
[2] Mwanza Ctr, Natl Inst Med Res, Dept Sexual & Reprod Hlth, Mwanza, Tanzania
[3] Johns Hopkins Bloomberg Sch Publ Hlth, Social & Behav Intervent Program, Dept Int Hlth, Baltimore, MD USA
[4] Jhpiego Tanzania, Dar Es Salaam, Tanzania
[5] Univ N Carolina, Dept Epidemiol, Gillings Sch Global Publ Hlth, Chapel Hill, NC 27515 USA
[6] Univ N Carolina, Carolina Populat Ctr, Chapel Hill, NC 27515 USA