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van Helvoort HA, Willems LM, Dekhuijzen PR, van Hees HW, Heijdra YF.van Helvoort HA, et al.NPJ Prim Care Respir Med. 2016 Oct 13;26:16054. doi: 10.1038/npjpcrm.2016.54.NPJ Prim Care Respir Med. 2016.PMID: 27734959Free PMC article.
van Helvoort HA, van de Pol MH, Heijdra YF, Dekhuijzen PN.van Helvoort HA, et al. Among authors: van de pol mh.Respir Med. 2005 Dec;99(12):1555-67. doi: 10.1016/j.rmed.2005.03.028.Respir Med. 2005.PMID: 15890510Free article.
van Helvoort HA, Heijdra YF, Dekhuijzen PN.van Helvoort HA, et al.Respiration. 2006;73(2):255-64. doi: 10.1159/000091117. Epub 2006 Jan 19.Respiration. 2006.PMID: 16432297Review.
van Helvoort HA, Heijdra YF, de Boer RC, Swinkels A, Thijs HM, Dekhuijzen PN.van Helvoort HA, et al.Chest. 2007 Feb;131(2):439-45. doi: 10.1378/chest.06-1655.Chest. 2007.PMID: 17296645Clinical Trial.
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Hargardóttir H, van Helvoort HA, Vonk MC, van den Hoogen FH, Dekhuijzen PN, Heijdra YF.Hargardóttir H, et al. Among authors: van helvoort ha, van den hoogen fh.Scand J Rheumatol. 2010;39(1):63-70. doi: 10.3109/03009740903124416.Scand J Rheumatol. 2010.PMID: 20132073