A MULTICENTRE, NON-INTERVENTIONAL, RETROSPECTIVE STUDY TO EXPLORE THE EFFECTS OF TRANSITIONING FROM IMMEDIATE RELEASE TO EXTENDED RELEASE ORAL CYSTEAMINE THERAPY IN NORWEGIAN PATIENTS WITH NEPHROPATHIC CYSTINOSIS (CYSTRANSFER) First published 08/06/2020 Last updated 01/02/2022 EU PAS number:EUPAS35491 Study Ongoing