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Fogh S, Schapira A, Bygbjerg IC, Jepsen S, Mordhorst CH, Kuijlen K, Ravn P, Rønn A, Gøtzsche PC.Fogh S, et al. Among authors: ravn p.Br Med J (Clin Res Ed). 1988 Mar 19;296(6625):820-2. doi: 10.1136/bmj.296.6625.820.Br Med J (Clin Res Ed). 1988.PMID: 3130927Free PMC article.Clinical Trial.
Rose MV, Kimaro G, Kroidl I, Hoelscher M, Bygbjerg IC, Mfinanga SM, Ravn P.Rose MV, et al. Among authors: ravn p.Eur Respir J. 2013 Apr;41(4):909-16. doi: 10.1183/09031936.00194311. Epub 2012 Aug 9.Eur Respir J. 2013.PMID: 22878880Free article.