1. Department of Global Health, University of Washington, Seattle, USA
2. Institute of Tropical and Infectious Diseases, University of Nairobi, Nairobi, Kenya
3. Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya
4. College of Nursing, New York University, New York, USA
5. Departments of Medicine, Epidemiology and Global Health, University of Washington, Seattle, USA