1. Hospital Infantil Albert Sabin, Fortaleza, Brazil;
2. Department of Pediatrics and Neurology, Universidade Estadual do Ceará, Fortaleza, Brazil;
3. Association for Assistance of Disabled Children, Recife, Brazil;
4. Hospital Barāo de Lucena, Recife, Brazil;
5. Centers for Disease Control and Prevention, Atlanta, Georgia;
6. Osvaldo Cruz University Hospital, University of Pernambuco, Recife, Brazil;
7. Department of Population Health Sciences, School of Medicine and Public Health, University of Wisconsin–Madison, Madison, Wisconsin; and
8. Departments of Neurology, Medicine (Infectious Diseases), and Epidemiology, University of Colorado, Denver, Colorado