1. From the Department of Radiology, Royal Melbourne Hospital, 300 Grattan St, Parkville, VIC 3050, Australia (J.S.N.T., J.K.C.L., J.B., W.W., P.S., D.G., J.C., D.M.P., S.B.H., F.G., E.L.); and Department of Radiology, University of Melbourne, Melbourne, Australia (J.K.C.L., J.B., W.W., P.S., D.M.P., S.B.H., F.G., E.L.).