1. Laboratory of Public Health, School of Public Health, University of São Paulo, Avenida Doutor Arnaldo 715, 01246-904 São Paulo SP, Brazil
2. Department of Environmental Health, School of Public Health, University of São Paulo, Avenida Doutor Arnaldo 715, 01246-904 São Paulo SP, Brazil
3. Departamento de Hidráulica, Escola Politécnica, University of São Paulo, Avenida Professor Almeida Prado 271, 05508-900 São Paulo SP, Brazil