1. Department of Health Promotion and Behavioral Sciences, The University of Texas Health Science Center at Houston School of Public Health, Houston, TX 77030, USA
2. Department of Medical Microbiology, University of Nairobi, P.O Box 19676, Nairobi 00202, Kenya
3. KAVI-Institute of Clinical Research, University of Nairobi, P.O. Box 19676, Nairobi 00202, Kenya
4. Department of Public and Global Health, University of Nairobi, P.O. Box 19676, Nairobi 00202, Kenya
5. Department of Reproductive Health, Moi University, P.O. Box 3900, Eldoret 30100, Kenya
6. Department of Epidemiology, Human Genetics and Environmental Sciences, The University of Texas Health Science Center at Houston School of Public Health, Dallas, TX 75207, USA
7. Center for Pediatric Population Health, University of Texas Health Science Center at Houston School of Public Health, Dallas, TX 75207, USA
8. Department of Pediatrics, McGovern Medical School, Houston, TX 77030, USA