Accuracy of multiecho magnitude-based MRI (M-MRI) for estimation of hepatic proton density fat fraction (PDFF) in children. - Zand KA; Shah A; Heba E; Wolfson T; Hamilton G; Lam J; Chen J; Hooker JC; Gamst AC; Middleton MS; Schwimmer JB; Sirlin CB (Journal of magnetic resonance imaging : JMRI, 2015)