1. Pediatric Headache Program Children’s Hospital of Philadelphia Philadelphia Pennsylvania USA
2. Department of Neurology Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania USA
3. School of Arts and Sciences University of Richmond Richmond Virginia USA
4. UCSF Child & Adolescent Headache Program San Francisco California USA
5. Doernbecher Children’s Hospital Child and Adolescent Headache Program, Division of Pediatric Neurology Oregon Health & Science University Portland Oregon USA