1. School for Environment and Sustainability, University of Michigan, Ann Arbor, Michigan;
2. Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, Michigan;
3. Microbiology Institute, Universidad San Francisco de Quito, Quito, Ecuador;
4. Department of Internal Medicine, Division of Infectious Diseases, University of Michigan Medical School, Ann Arbor, Michigan;
5. Department of Biostatistics, School of Public Health, University of Michigan, Ann Arbor, Michigan;
6. Department of Epidemiology and Biostatistics, Michigan State University, East Lancing, Michigan