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Introduction to the special series on the chronification of headache: Mechanisms, risk factors, and behavioral strategies aimed at primary and secondary prevention of chronic headache

Penzien, D.B., Rains, J.C., & Lipton, R.B. . Introduction to the special series on the chronification of headache: Mechanisms, risk factors, and behavioral strategies aimed at primary and secondary prevention of chronic headache. Headache. 2008; 48:5-6.