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Zahl PH, Kopjar B, Maehlen J.Zahl PH, et al.Tidsskr Nor Laegeforen. 2001 Jun 20;121(16):1928-31.Tidsskr Nor Laegeforen. 2001.PMID: 11488185Free article.Norwegian.
Strand BH, Tverdal A, Claussen B, Zahl PH.Strand BH, et al. Among authors: zahl ph.Int J Cancer. 2005 Dec 20;117(6):1002-6. doi: 10.1002/ijc.21239.Int J Cancer. 2005.PMID: 15986427Free article.