By Svensson Dan   Waldenlind Elisabet   Ekbom Karl   Pedersen Nancy   in The Journal of Headache and Pain

ISSN:1129-2369|5|3|171-176

Springer Publishing Company ‎(2004)‎

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By Svensson Dan A.   Larsson Bo   Waldenlind Elisabet   Pedersen Nancy L.   in Twin Research

ISSN:1369-0523|5|4|277-286

Australian Academic Press‎(2002)‎

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