[1] PO Pineta Grande, Dept Diagnost Imaging, Caserta, Italy
[2] Dartford & Gravesham NHS Trust, Dept Radiol, Dartford, Kent, England
[3] Osped Riuniti Valdichiana, Stabilimento Osped Nottola Montepulciano, UO Radiol, Siena, Italy
[4] Univ Gabriele DAnnunzio, Dept Clin Sci & Bioimaging, Sect Diagnost Imaging, Chieti, Italy
[5] Univ Rochester, Med Ctr, Dept Imaging Sci, Div Emergency Imaging, Rochester, NY 14642 USA