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Smits PB, de Buisonjé CD, Verbeek JH, van Dijk FJ, Metz JC, ten Cate OJ.Smits PB, et al.Scand J Work Environ Health. 2003 Aug;29(4):280-7. doi: 10.5271/sjweh.732.Scand J Work Environ Health. 2003.PMID: 12934721Free article.Clinical Trial.
Schaafsma F, Hugenholtz N, de Boer A, Smits P, Hulshof C, van Dijk F.Schaafsma F, et al. Among authors: smits p.Scand J Work Environ Health. 2007 Oct;33(5):368-78. doi: 10.5271/sjweh.1156.Scand J Work Environ Health. 2007.PMID: 17973063Free article.Clinical Trial.
Smits PB, de Boer AG, Kuijer PP, Braam I, Spreeuwers D, Lenderink AF, Verbeek JH, van Dijk FJ.Smits PB, et al.Occup Med (Lond). 2008 Aug;58(5):373-5. doi: 10.1093/occmed/kqn061. Epub 2008 May 25.Occup Med (Lond). 2008.PMID: 18504259
Smits PB, de Graaf L, Radon K, de Boer AG, Bos NR, van Dijk FJ, Verbeek JH.Smits PB, et al.Occup Environ Med. 2012 Apr;69(4):280-3. doi: 10.1136/oemed-2011-100317. Epub 2011 Oct 27.Occup Environ Med. 2012.PMID: 22034545Clinical Trial.