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Orthuber W, Fiedler G, Kattan M, Sommer T, Fischer-Brandies H.Orthuber W, et al.Open Med Inform J. 2008;2:21-31. doi: 10.2174/1874431100802010021. Epub 2008 Mar 13.Open Med Inform J. 2008.PMID: 19415132Free PMC article.