Headache Disorders, Primary

• San Francisco Clinical Research Center — San Francisco, California, United States
• Westside Family Medical Center — Kalamazoo, Michigan, United States
• Clinvest — Springfield, Missouri, United States
• Mercy Health Research/Ryan Headache Center — St Louis, Missouri, United States

• California Medical Clinic for Headache — Santa Monica, California, United States

• Danish Headache Center — Glostrup Municipality, Denmark

• GSK Investigational Site — Chandler, Arizona, United States
• GSK Investigational Site — Gilbert, Arizona, United States
• GSK Investigational Site — Litchfield Park, Arizona, United States
• GSK Investigational Site — Mesa, Arizona, United States

Not specified

Not specified

Not specified

• Research Site — Uppsala, Sweden

• Chengdu University of TCM — Chengdu, Sichuan, China

• Brian Koffman, MD — Diamond Bar, California, United States
• San Francisco Clinical Research Center — San Francisco, California, United States
• Physician Associates — Oviedo, Florida, United States
• Dr. B. Abraham, PC — Snellville, Georgia, United States