1. Department of Pathology & Laboratory Medicine, School of Medicine, Emory University, Atlanta, GA, USA
2. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA, USA
3. Departments of Gynecology and Obstetrics (B.V.), Internal Medicine (S.L.) and Surgery (R.C.), School of Medicine, University of Zambia, Lusaka, Zambia
4. Department of Gynecology and Obstetrics, Emory University, School of Medicine, Atlanta, GA, USA
5. Department of Epidemiology, Ryals School of Public Health, University of Alabama at Birmingham, Birmingham, AL, USA and
6. Ministry of Community Development, Mother and Child Health, Lusaka, Zambia