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Korfage IJ, de Koning HJ, Essink-Bot ML.Korfage IJ, et al.Qual Life Res. 2007 Dec;16(10):1627-34. doi: 10.1007/s11136-007-9265-6. Epub 2007 Oct 5.Qual Life Res. 2007.PMID: 17917793Free PMC article.