Headache Disorders

• Multidisciplinary Pain Centre, Univ. Alta Hospital — Edmonton, Alberta, Canada

• Children's Mercy Hospital — Kansas City, Missouri, United States

• University of North Carolina at Chapel Hill — Chapel Hill, North Carolina, United States

• UCLA Pediatric Pain Management Clinic — Los Angeles, California, United States

• Johns Hopkins School of Medicine — Baltimore, Maryland, United States

• Department of Neuroscience, Norwegian University of Science and Technology — Trondheim, Norway

• John A Moran Eye Center; University of Utah Hospitals and Clinics — Salt Lake City, Utah, United States

Not specified

• Akershus University Hospital — Lørenskog, Norway
• Dept of general medicine, University of Oslo — Oslo, Norway

• Haseki Training and Research Hospital — Istanbul, Turkey (Türkiye)