1. Santa Casa de São Paulo Medical Sciences University
2. Pan American Health Organization, Brasilia
3. National Center for Immunizations and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
4. Municipal Health Department, Campinas, Brazil
5. National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland
6. Instituto Adolfo Lutz-São Paulo, São Paulo