1. Department of Pediatrics, Denver Health Hospital Authority, Denver, Colorado;
2. Center for Global Health and Department of Epidemiology, Colorado School of Public Health, Aurora, Colorado;
3. Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado;
4. Hospital Roosevelt, Guatemala City, Guatemala;
5. Centro de Estudios en Salud, Universidad de Valle de Guatemala, Guatemala, Guatemala;
6. Department of Pathology and Laboratory Medicine, Children’s Hospital Colorado, Aurora, Colorado