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Rovithis E, Lionis C, Schiza SE, Bouros D, Karokis A, Vlachonikolis I, Siafakas NM.Rovithis E, et al. Among authors: siafakas nm.BMC Med Educ. 2001;1:2. doi: 10.1186/1472-6920-1-2. Epub 2001 Aug 1.BMC Med Educ. 2001.PMID: 11511327Free PMC article.