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Hysong SJ, Sawhney MK, Wilson L, Sittig DF, Espadas D, Davis T, Singh H.Hysong SJ, et al. Among authors: sittig df.J Am Med Inform Assoc. 2010 Jan-Feb;17(1):71-7. doi: 10.1197/jamia.M3200.J Am Med Inform Assoc. 2010.PMID: 20064805Free PMC article.