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Heijdra YF, Dekhuijzen PN, van Herwaarden CL, Folgering HT.Heijdra YF, et al. Among authors: dekhuijzen pn.Eur Respir J. 1993 Apr;6(4):541-6.Eur Respir J. 1993.PMID: 8491305
Dekhuijzen PN, Bootsma GP, Wielders PL, van den Berg LR, Festen J, van Herwaarden CL.Dekhuijzen PN, et al.Eur Respir J. 1997 Dec;10(12):2749-53. doi: 10.1183/09031936.97.10122749.Eur Respir J. 1997.PMID: 9493655Free article.Clinical Trial.