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Tognolini A, Al-Ahmad A, Wang PJ, Hsia HH, Herfkens RJ, Girard E, Moore T, Fahrig R.Tognolini A, et al. Among authors: herfkens rj.Acad Radiol. 2011 Jul;18(7):850-7. doi: 10.1016/j.acra.2011.01.023. Epub 2011 Mar 25.Acad Radiol. 2011.PMID: 21440465Free PMC article.