By Tronvik Erling   Zwart John-Anker   Hagen Knut   Dyb Grete   Holmen Turid   Stovner Lars   in The Journal of Headache and Pain

ISSN:1129-2369|12|3|347-353

Springer Publishing Company ‎(2011)‎

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By Dyb Grete   Holen Are   Brænne Kjersti   Indredavik Marit S.   Aarseth Jon   in Nordic Journal of Psychiatry

ISSN:0803-9488|57|5|339-344

Informa Healthcare‎(2003)‎

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