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Janssens HM, Heijnen EM, de Jong VM, Hop WC, Holland WP, de Jongste JC, Tiddens HA.Janssens HM, et al. Among authors: heijnen em.Eur Respir J. 2000 Nov;16(5):850-6. doi: 10.1183/09031936.00.16585000.Eur Respir J. 2000.PMID: 11153582Free article.Clinical Trial.