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Cluster Headache Help Resources, questionnaires and links for those affected with the disorder. http://www.chhelp.org/
Organization for Understanding Cluster Headaches Information about OUCH and its activities. Includes a quiz, medical information, comparison table and the International Headache Society diagnostic criteria. http://www.clusterheadaches.org/
Roger Hayes Complete informational guide to headache, includes information on Headache, Cluster & Sinus headaches their causes and symtomps. http://www.headachecure.org/