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Klein Velderman M, Bakermans-Kranenburg MJ, Juffer F, van IJzendoorn MH.Klein Velderman M, et al. Among authors: juffer f.J Fam Psychol. 2006 Jun;20(2):266-274. doi: 10.1037/0893-3200.20.2.266.J Fam Psychol. 2006.PMID: 16756402Free article.Clinical Trial.