1. Center for Clinical and Epidemiological Research of University HospitalUniversity of Sao Paulo Sao Paulo SP Brazil
2. Department of Biological SciencesFederal University of Vale do Sao Francisco Petrolina PE Brazil
3. Department of Electrical EngineeringFederal Institute of Espirito Santo Vitoria ES Brazil
4. Postgraduate Programme in EpidemiologyFederal University of Rio Grande do Sul Porto Alegre RS Brazil
5. Department of Social MedicineFederal University of Rio Grande do Sul Porto Alegre RS Brazil
6. Department of Physiological SciencesFederal University of Espírito Santo Vitoria ES Brazil