Scher, A.I., Stewart, W.F., Liberman, J. and Lipton, R.B. (1998) Wolff Award 1998 Prevalence of Frequent Headache in a Population Sample. Headache, 38, 497-506.
http://dx.doi.org/10.1046/j.1526-4610.1998.3807497.x

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