Standardized assessment of the signal intensity increase on unenhanced T1-weighted images in the brain: the European Gadolinium Retention Evaluation Consortium (GREC) Task Force position statement. - Quattrocchi, Carlo C.; Ramalho, Joana; van der Molen, Aart J.; Rovira, Àlex; Radbruch, Alexander; GREC, European Gadolinium Retention Evaluation Consortium and the ESNR, European Society of Neuroradiology (European Radiology, 2019)