1. Department of Epidemiology, Rollins School of Public HealthEmory University Atlanta Georgia USA
2. Hubert Department of Global Health, Rollins School of Public HealthEmory University Atlanta Georgia USA
3. Emory School of Medicine Atlanta Georgia USA
4. Servicio Departamental de Salud La Paz Bolivia
5. Instituto de Biotecnología y MicrobiologíaUniversidad Mayor de San Andrés La Paz Bolivia
6. Nutrition BranchCenters for Disease Control & Prevention Atlanta Georgia USA