Chronic Migraine

• UCSF Headache Center — San Francisco, California, United States
• Michigan Head Pain & Neurological Institute — Ann Arbor, Michigan, United States
• Headache Care Center — Springfield, Missouri, United States
• Montefiore Headache Center — The Bronx, New York, United States

• Instituto Israelita de Ensino e Pesquisa Albert Einstein — São Paulo, Brazil

• Michigan Head Pain & Neurological Institute — Ann Arbor, Michigan, United States
• Clinvest/A Division of Banyan Group, Inc. — Springfield, Missouri, United States

• University of Manitoba — Winnipeg, Manitoba, Canada

• Universidad San Jorge — Zaragoza, Spain

Not specified

• Hôpital Notre-Dame — Montreal, Quebec, Canada

• Clinvest/A Division of Banyan Group, Inc. — Springfield, Missouri, United States

• The Johns Hopkins Bayview Headache Center — Baltimore, Maryland, United States

• Hospital Universitario Clinico San Carlos-Universidad Complutense de Madrid — Madrid, Spain