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The Journal of Headache and Pain > 2013 > 14 > 1 > 1-12
The Journal of Headache and Pain > 2008 > 9 > 6 > 339-347
European Journal of Epidemiology > 2005 > 20 > 3 > 243-249
Wiener klinische Wochenschrift > 2004 > 116 > 5-6 > 176-181