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van Son J, Nyklíček I, Nefs G, Speight J, Pop VJ, Pouwer F.van Son J, et al. Among authors: nefs g.J Behav Med. 2015 Apr;38(2):251-60. doi: 10.1007/s10865-014-9592-3. Epub 2014 Aug 28.J Behav Med. 2015.PMID: 25164478