1. Division of Infectious Diseases and Global Public Health, Department of Medicine, University of California, San Diego, La Jolla, CA, USA
2. Department of Social Medicine, University of Rio Grande do Sul, Porto Alegre, Brazil
3. Division of Biostatistics and Bioinformatics, Department of Family Medicine and Public Health, University of California, San Diego, La Jolla, CA, USA
4. Department of Preventive and Social Medicine, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
5. Center for Population Studies, University of Campinas, São Paulo, Brazil