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Langhammer A, Johnsen R, Holmen J, Gulsvik A, Bjermer L.Langhammer A, et al.J Epidemiol Community Health. 2000 Dec;54(12):917-22. doi: 10.1136/jech.54.12.917.J Epidemiol Community Health. 2000.PMID: 11076988Free PMC article.
Langhammer A, Johnsen R, Gulsvik A, Holmen TL, Bjermer L.Langhammer A, et al.Eur Respir J. 2001 Nov;18(5):770-9. doi: 10.1183/09031936.01.00255301.Eur Respir J. 2001.PMID: 11757626Free article.
Langhammer A, Johnsen R, Gulsvik A, Holmen TL, Bjermer L.Langhammer A, et al.Eur Respir J. 2003 Jun;21(6):1017-23. doi: 10.1183/09031936.03.00053202.Eur Respir J. 2003.PMID: 12797498Free article.
Langhammer A, Norjavaara E, de Verdier MG, Johnsen R, Bjermer L.Langhammer A, et al.Pharmacoepidemiol Drug Saf. 2004 Aug;13(8):569-79. doi: 10.1002/pds.941.Pharmacoepidemiol Drug Saf. 2004.PMID: 15317039