1. Department of Epidemiology, Bloomberg School of Public Health Johns Hopkins University Baltimore Maryland USA
2. Department of Health Policy and Management, Bloomberg School of Public Health Johns Hopkins University Baltimore Maryland USA
3. Department of International Health, Bloomberg School of Public Health Johns Hopkins University Baltimore Maryland USA
4. Division of Transfusion Medicine, Department of Pathology, School of Medicine Johns Hopkins University Baltimore Maryland USA
5. Vitalant Medical Affairs Scottsdale Arizona USA
6. Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health Johns Hopkins University Baltimore Maryland USA
7. Department of Epidemiology, Gillings School of Global Public Health University of North Carolina Chapel Hill North Carolina USA
8. Carolina Population Center University of North Carolina Chapel Hill North Carolina USA