University of Toronto - Program for Neuroscience and Mental Health, University of Western Ontario - Department of Pediatrics, University of Toronto - Division of Infectious Diseases, University of Toronto - The Hospital for Sick Children - SickKids, University of Toronto - Division of Rheumatology, Caja Costarricense de Seguro Social (CCSS) - Hospital Nacional de Niños “Dr. Carlos Sáenz Herrera”, Caja Costarricense de Seguro Social (CCSS) - Hospital Nacional de Niños “Dr. Carlos Sáenz Herrera”, Caja Costarricense de Seguro Social (CCSS) - Hospital Nacional de Niños “Dr. Carlos Sáenz Herrera”, Caja Costarricense de Seguro Social (CCSS) - Hospital Nacional de Niños “Dr. Carlos Sáenz Herrera”, Caja Costarricense de Seguro Social (CCSS) - Pediatric Infectious Diseases Division, Caja Costarricense de Seguro Social (CCSS) - Hospital Nacional de Niños “Dr. Carlos Sáenz Herrera”, University of Toronto - Division of Rheumatology, University of Toronto - Department of Pediatrics, Iran University of Medical Sciences, Iran University of Medical Sciences, Iran University of Medical Sciences, University of Manitoba, University of Manitoba, McGill University - Montreal Children's Hospital, McGill University - Montreal Children's Hospital, University of Calgary, University of Calgary, University of Calgary, University of British Columbia (UBC) - Department of Pediatrics, British Columbia Children's Hospital Research Institute - Vaccine Evaluation Center, University of British Columbia (UBC) - Department of Pediatrics, McMaster University - Department of Pediatrics, University of Ottawa, University of Ottawa, University of Saskatchewan, University of Saskatchewan, Memorial University, University of Alberta - Stollery Children's Hospital and University of Toronto - Division of Neurology