The European Organisation for Research and Treatment of Cancer QLQ-C30: A Quality-of-Life Instrument for Use in International Clinical Trials in Oncology. - Aaronson,N.; Ahmedzai,S.; Bergmann,B.; Bullinger,M.; Cull,A.; Duez,N.J.; Filiberti,A.; Flechtner,H.; de Haes,J.CJM.; Kaasa,S.; Klee,M.; Osoba,D.; et al. (J of Nat Cancer Institute, 1993)