1. Department of Biostatistics Brown University 121 S. Main Street Providence 02912 RI USA
2. Academic Model Providing Access to Healthcare (AMPATH) Eldoret Kenya
3. Department of Epidemiology Johns Hopkins Bloomberg School of Public Health Maryland U.S.A
4. Division of Biostatistics, School of Medicine Indiana University Indiana USA
5. College of Health Sciences, School of Medicine Moi University Eldoret Kenya
6. Dalla Lana School of Public Health University of Toronto
7. Fairbanks School of Public Health Indiana University Indiana USA
8. Regenstrief Institute Indiana USA