FP771IOHEXOL CLEARANCE IN CHILDREN WITH LOW GFR: COMPARISON OF 24 HOURS SINGLE-POINT GFR AND MULTIPLE-POINT GFR. (18th May 2018) - Tøndel, Camilla; Salvador, Cathrin; Hufthammer, Karl Ove; Bolann, Bjørn; Brackman, Damien; Bjerre, Anna; Svarstad, Einar; Brun, Atle