By Nilsen Einar   in Scandinavian Journal of Infectious Diseases

ISSN:0036-5548|44|11|860-865

Informa Healthcare‎(2012)‎

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By Rød Jan Ketil   Larsen Wenche   Nilsen Einar   in Norwegian Journal of Geography

ISSN:0029-1951|64|1|21-35

Routledge Ltd‎(2010)‎

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