1. From the Center for Global Health, Weill Cornell Medical College, New York, NY (S.A.F., R.P.)
2. Department of Internal Medicine, Weill Bugando School of Medicine, Mwanza, Tanzania (S.A.F., R.P.)
3. Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC (G.S.B.)
4. Mwanza Interventions Trial Unit, Tanzania (R.P.).