Neurological Research Institute, Santa Monica, California, United States
FPA Clinical Research, Kissimmee, Florida, United States
Manna Research, Inc., Toronto, Ontario, Canada
Comprehensive Neuroscience, Inc., St. Petersburg, Florida, United States
Elkind Headache Center, Mount Vernon, New York, United States
Comprehensive NeuroScience, Inc. Atlanta, Atlanta, Georgia, United States
The Research Center of Southern California, LLC, Oceanside, California, United States
C. Philip O'Carrroll, MD, Inc., Newport Beach, California, United States
San Francisco Headache Clinic, San Francisco, California, United States