Research Site, Montreal, Quebec, Canada
The University of Chicago, Dept. of Surgery, Section of Neurosurgery, Chicago, Illinois, United States
The Center for Pain Relief, Charleston, West Virginia, United States
Alabama Pain Center, Huntsville, Alabama, United States
Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, United States
University of South Alabama Medical Ctr Department of Neurology, Mobile, Alabama, United States
The New England Center for Headache, Stamford, Connecticut, United States
Tennesee Valley Pain Consultants - Center For Pain Management, Huntsville, Alabama, United States
Abaci and Massey Pain Center, Los Gatos, California, United States
Pain Care Specialists, Colorado Springs, Colorado, United States
The Neurology Center, Oceanside, California, United States
Neurology Medical Group of Diablo Valley, Walnut Creek, California, United States
Northridge Neurological Center, Northridge, California, United States