Sphenopalatine Ganglion Stimulation for the Treatment of Chronic Cluster Headache

Lenox Hill Hospital, The New York Head and Neck Institute - SURGICAL CENTER ONLY, NOT AN ENROLLING CENTER, New York

Mount Sinai Hospital, New York

Island Neurological Association, Plainview

Dent Neurosciences Research Institute, Amherst

Jefferson Headache Center, Thomas Jefferson University, Philadelphia

Inova Medical Group Neurology and Headache, Falls Church

Carolina Headache Institute, Durham

The Ohio State University Wexner Medical Center, Columbus

Robbins Headache Clinic, Northbrook

University of Chicago, Illinois - SURGICAL CENTER ONLY, NOT AN ENROLLING CENTER, Chicago

Diamond Headache Clinic, Chicago

Mercy Health Research, St Louis

Headache Care Center (Springfield), Springfield

Mayo Clinic, Phoenix

Nevada Headache Institute, Las Vegas

University of Southern California, Los Angeles

Stanford University, Stanford

Yale University, New Haven

New England Institute for Clinical Research, Stamford

Norton Neurology Services, Louisville

New England Regional Headache Center, Worcester

Michigan Headache and Neurological Institute, Ann Arbor

Dartmouth Hitchcock-Medical Center, Lebanon

University of Texas, Southwestern, Dallas