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Showing articles 0 to 2 of 2 Filter Applied: headache,hypnic (Click to remove) Cluster Headache:Pathogenesis,Diagnosis, and Management Lancet 366:843-855, May,A., 2005 Severe Headaches, When to Worry, What To Do Postgrad Med 83:164-180, Drexler,E.D., 1990 Showing articles 0 to 2 of 2