Saturday, November 22, 2008 - 6:41AM EST

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Sweden

Name of AuthorInstitutional Affiliation
Jansson MDepartment of Occupational and Environmental Medicine, Orebro University Hospital, Orebro, Sweden. markus.janson@orebroll.sc
Linton SJDepartment of Occupational and Environmental Medicine, Orebro University Hospital, Orebro, Sweden.