By Janson Harald   Kjelsberg Ellen   in Nordic Journal of Psychiatry

ISSN:0803-9488|60|2|168-175

Informa Healthcare‎(2006)‎

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By Torgersen Anne Mari   Janson Harald   in Twin Research

ISSN:1369-0523|5|1|44-52

Australian Academic Press‎(2002)‎

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