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The Journal of Headache and Pain > 2018 > 19 > 1 > 1-6
European Journal of Epidemiology > 2005 > 20 > 3 > 243-249
The Journal of Headache and Pain > 2018 > 19 > 1 > 1-6
European Journal of Epidemiology > 2005 > 20 > 3 > 243-249