1. Department of Family Medicine, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina , USA
2. Takeda Vaccines, Inc. , Cambridge, Massachusetts , USA
3. Center of Infectious Diseases, Department of Microbiology and Parasitology, Faculty of Medical Sciences, National Autonomous University of Nicaragua , León, León , Nicaragua
4. Department of Epidemiology, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina , USA
5. Department of Environmental and Radiological Health Sciences, Colorado State University , Fort Collins, Colorado , USA