University of Colorado Denver, University of Colorado, Aurora - Department of Pediatrics, University of Washington - School of Medicine, affiliation not provided to SSRN, University of Washington - School of Medicine, University of California, Berkeley, University of California, San Francisco (UCSF) - Department of Epidemiology and Biostatistics, University of North Carolina at Chapel Hill, Johns Hopkins University, University of Washington - School of Medicine, University of Washington - School of Medicine, University of Washington - School of Medicine, University of Washington - School of Medicine, University of Washington - School of Medicine, Kenya Medical Research Institute (KEMRI), Kenya Medical Research Institute (KEMRI) and affiliation not provided to SSRN