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Westin AA, Walstad RA, Spigset O.Westin AA, et al. Among authors: walstad ra.Tidsskr Nor Laegeforen. 2009 Dec 17;129(24):2610-2. doi: 10.4045/tidsskr.09.0982.Tidsskr Nor Laegeforen. 2009.PMID: 20029557Free article.Norwegian.