1. School of Public Health, University of Michigan, Ann Arbor, Michigan;
2. School of Public Health, University of California Berkeley, Berkeley, California;
3. Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, Georgia;
4. Instituto de Biomedicina Universidad Central, Quito, Ecuador;
5. Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington