Liver imaging reporting and data system category 4 observations in MRI: Risk factors predicting upgrade to category 5. - Sofue K; Burke LMB; Nilmini V; Alagiyawanna M; Muir AJ; Choudhury KR; Jaffe TA; Semelka RC; Bashir MR (Journal of magnetic resonance imaging : JMRI, 2017)