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Schubert M, Glass TR, Clarke SP, Aiken LH, Schaffert-Witvliet B, Sloane DM, De Geest S.Schubert M, et al. Among authors: aiken lh.Int J Qual Health Care. 2008 Aug;20(4):227-37. doi: 10.1093/intqhc/mzn017. Epub 2008 Apr 24.Int J Qual Health Care. 2008.PMID: 18436556Free PMC article.