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Wickman M, Farahmand BY, Persson PG, Pershagen G.Wickman M, et al. Among authors: persson pg.Eur Respir J. 1998 Feb;11(2):366-70. doi: 10.1183/09031936.98.11020366.Eur Respir J. 1998.PMID: 9551740Free article.