Two non-invasive GFR-estimation methods in rat models of polycystic kidney disease: 3.0 Tesla dynamic contrast-enhanced MRI and optical imaging. - Sadick M; Attenberger U; Kraenzlin B; Kayed H; Schoenberg SO; Gretz N; Schock-Kusch D (Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association, 2011)