1 Department of Community Health, Institute of Tropical Pathology and Public Health, Federal University of Goiás, Goiânia, Goiás, Brazil. Electronic address: [email protected].
2 Instituto Nacional de Salud, Lima, Peru.
3 Pan American Health Organization, PWR-Peru, Lima, Peru.
4 Sanas Epidemiology and Research, São Paulo, Brazil.
5 Independent Consultant.
6 Institute of Mathematics and Statistics (IME), University of São Paulo, São Paulo, Brazil.
7 Comprehensive Family Immunization Project, Pan American Health Organization, Washington, DC, USA.