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Drent M, Wagenaar S, van Velzen-Blad H, Mulder PG, Hoogsteden HC, van den Bosch JM.Drent M, et al. Among authors: mulder pg.Thorax. 1993 Aug;48(8):835-9. doi: 10.1136/thx.48.8.835.Thorax. 1993.PMID: 8105558Free PMC article.
Overbeek SE, Kerstjens HA, Bogaard JM, Mulder PG, Postma DS.Overbeek SE, et al. Among authors: mulder pg.Chest. 1996 Jul;110(1):35-41. doi: 10.1378/chest.110.1.35.Chest. 1996.PMID: 8681660Clinical Trial.