1. Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
2. Division of Child Neurology, Department of Pediatrics, Montreal Children’s Hospital, McGill University, Montreal, Quebec, Canada
3. Department of Neurology and Neurosurgery, Montreal Children’s Hospital, McGill University, Montreal, Quebec, Canada
4. Department of Neurology, Children's Hospital of Philadelphia and University of Pennsylvania, Philadelphia, PA, USA
5. Department of Pediatric Anesthesiology, McGill University Health Center, Montreal, Quebec, Canada
6. Department of Radiology, McGill University Health Center, Montreal, Quebec, Canada
7. Faculty of Medicine, McGill University, Montreal, Quebec, Canada
8. Child and Adolescent Headache Program, University of California San Francisco, San Francisco, CA, USA
9. Department of Child Neurology, Cardinal Glennon Children's Hospital, St. Louis University School of Medicine, St. Louis, MO, USA
10. Departments of Pediatrics and Neurology, Cincinnati Children’s Hospital Medical Center and University of Cincinnati College of Medicine, Cincinnati, OH, USA
11. Department of Neurology, Louisiana State University Health Sciences Center and Children’s Hospital New Orleans, New Orleans, LA, USA
12. Division of Neurology, Hospital for Sick Children and Women's College Hospital, University of Toronto, Toronto, Ontario, Canada
13. Division of Neurology, Department of Pediatrics, Alberta Children’s Hospital, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada