Development of computer-adaptive testing (CAT): Building new systems or transforming existing instruments? An analysis of the consequences of the EORTC CAT strategy - Groenvold, M; Petersen, M; Aaronson, NK; Chie, WC; Conroy, T; Costantini, A; Fayers, PM; Giesinger, J; Helbostad, J; Holzner, B; Kaasa, S; Singer, S; Velikova, G; Verdonck-de Leeuw, IM; Young, T (Quality of Life Research, 2010)