University of Toronto - Program for Neuroscience and Mental Health, University of Toronto - Division of Infectious Diseases, University of Toronto - Department of Diagnostic Imaging, University of Toronto - Division of Neurology, University of Manitoba - Department of Pediatrics & Child Health, McGill University - Montreal Children's Hospital, McGill University - Montreal Children's Hospital, McGill University - Montreal Children's Hospital, McGill University - Montreal Children's Hospital, University of Montreal - Division of Immunology and Rheumatology, University of Montreal - Division of Immunology and Rheumatology, University of Montreal - Division of Neurology, University of Western Ontario - Department of Pediatrics, University of Western Ontario - Department of Pediatrics, Children's Hospital of Eastern Ontario Research Institute (CHEO) - Division of Infectious Diseases, Children's Hospital of Eastern Ontario Research Institute (CHEO) - Pediatric Neurology, Children's Hospital of Eastern Ontario Research Institute (CHEO) - Pediatric Neurology, British Columbia Children's Hospital - Division of Pediatric Neurology, McMaster Children's Hospital, University of Alberta - Stollery Children's Hospital, University of Calgary - Section of Neurology, University of Toronto - Department of Pediatrics, University of Toronto - Department of Diagnostic Imaging and University of Toronto - Division of Neurology