Wohl Eye Center, Bloomingdale, Illinois, United States
NorthShore University HealthSystem, Glenview, Illinois, United States
Chicago Cornea Consultants, Ltd., Hoffman Estates, Illinois, United States
Michigan Head Pain and Neurological Institute, Ann Arbor, Michigan, United States
California Medical Clinic for Headache, Santa Monica, California, United States
Meridien Research, Tampa, Florida, United States
Neurology Clinical Research, Inc., Sunrise, Florida, United States
Michigan Head-Pain and Neurological Institute, Ann Arbor, Michigan, United States
U.T. Pain Specialist, Etobicoke, Ontario, Canada
Parexel International, Inc., Baltimore, Maryland, United States
International Research Services, Inc., Port Chester, New York, United States
NC Arthritis and Allergy Care Center, Raleigh, North Carolina, United States
Chesapeake Medical Research, LLC, Baltimore, Maryland, United States
University Hospitals of Cleveland, Beachwood, Ohio, United States
California Medical Clinic for Headache, Santa Monica, California, United States
Diamond Headache Clinic, Chicago, Illinois, United States
Colorado Neurology and Headache Clinic, Denver, Colorado, United States
The Headache Wellness Center, Greensboro, North Carolina, United States
Diamond Headache Clinic, Chicago, Illinois, United States
Neurological Associates of Tucson, Tucson, Arizona, United States