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Sjaastad, Ottar and Bakketeig, Leiv Sigmund (2008) Tension-type headache. Comparison with migraine without aura and cervicogenic headache. The Vågå study of headache epidemiology. Functional Neurology; New Trends in Interventional Neurosciences, 23 (2). pp. 71-76. ISSN 1971-3274