FO055EVALUATION OF PREDICTION MODELS FOR PROGRESSION OF CHRONIC KIDNEY DISEASE TO KIDNEY FAILURE: A COMPREHENSIVE EXTERNAL VALIDATION STUDY. (13th June 2019) - Ramspek, Chava; Evans, Marie; Heimburger, Olof; Chesnaye, Nicholas; Szymczak, Maciej; Roderick, Paul; Caskey, Fergus; Wanner, Christoph; Dekker, Friedo; Jager, Kitty; Van Diepen, Merel