1. Department of Health Care Organization and Policy and Sparkman Center for Global Health, School of Public Health The University of Alabama at Birmingham Birmingham Alabama USA
2. Centre for Microbiology Research Kenya Medical Research Institute Nairobi Kenya
3. Department of Pediatrics, School of Medicine University of Colorado Denver Aurora Colorado USA
4. Department of Obstetrics and Gynecology University of Colorado Denver, Anschutz Medical Campus Aurora Colorado USA
5. Department of Biostatistics, School of Public Health The University of Alabama at Birmingham Birmingham Alabama USA
6. Department of Medicine University of Missouri Kansas City Missouri USA