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van der Heide I, van Rijn RM, Robroek SJ, Burdorf A, Proper KI.van der Heide I, et al. Among authors: proper ki.BMC Public Health. 2013 Dec 13;13:1180. doi: 10.1186/1471-2458-13-1180.BMC Public Health. 2013.PMID: 24330730Free PMC article.Review.
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Verweij LM, Proper KI, Weel AN, Hulshof CT, van Mechelen W.Verweij LM, et al. Among authors: proper ki.BMC Public Health. 2009 Dec 14;9:461. doi: 10.1186/1471-2458-9-461.BMC Public Health. 2009.PMID: 20003405Free PMC article.Clinical Trial.
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Groeneveld IF, Proper KI, van der Beek AJ, Hildebrandt VH, van Mechelen W.Groeneveld IF, et al. Among authors: proper ki.BMC Public Health. 2011 Oct 31;11:836. doi: 10.1186/1471-2458-11-836.BMC Public Health. 2011.PMID: 22040007Free PMC article.Clinical Trial.
Viester L, Verhagen EA, Proper KI, van Dongen JM, Bongers PM, van der Beek AJ.Viester L, et al. Among authors: proper ki.BMC Public Health. 2012 Jan 30;12:89. doi: 10.1186/1471-2458-12-89.BMC Public Health. 2012.PMID: 22289212Free PMC article.Clinical Trial.