Posttraumatic Headache

• VA Greater Los Angeles Healthcare System — Los Angeles, California, United States
• VA Palo Alto Health Care System — Palo Alto, California, United States
• Tripler Army Medical Center (Desmond Doss Health Clinic, Schofield Barracks) — Honolulu, Hawaii, United States
• Walter Reed National Military Medical Center — Bethesda, Maryland, United States

• Anesthesiology Pain Medicine Center — Chicago, Illinois, United States
• Walter Reed National Military Medical Center — Bethesda, Maryland, United States
• Womack Army Medical Center — Fort Bragg, North Carolina, United States

• Rigshospitalet-Glostrup — Glostrup Municipality, Denmark

• Danish Headache Center — Glostrup Municipality, Denmark

• Womack Army Medical Center - Fort Liberty — Fort Bragg, North Carolina, United States
• University of Pittsburgh Concussion Research Laboratory — Pittsburgh, Pennsylvania, United States
• William Beaumont Army Medical Center — El Paso, Texas, United States
• Madigan Army Medical Center — Tacoma, Washington, United States

• Danish Headache Center — Copenhagen, Region H, Denmark

Not specified

• VA Puget Sound Health Care System Seattle Division, Seattle, WA — Seattle, Washington, United States

• St Olavs Hospital — Trondheim, Norway

• BC Children's Hospital — Vancouver, British Columbia, Canada