Response to: 'Use of dual-energy CT to detect and depict bone marrow oedema in rheumatoid arthritis: is it ready to substitute MRI?' by Wu et al. Issue 9 (12th September 2019) - Jans, Lennart; De Kock, Isabelle; Herregods, Nele; Verstraete, Koenraad L; Van den Bosch, Filip E; Carron, Philippe; Oei, Edwin H; Elewaut, Dirk; Jacques, Peggy