General Spanish population normative data analysis for the EORTC QLQ-C30 by sex, age, and health condition oleh Juan Ignacio Arraras, Sandra Nolte, Gregor Liegl, Matthias Rose, Ana Manterola, Jose Juan Illarramendi, Uxue Zarandona, Mikel Rico, Lucia Teiejria, Gemma Asin, Irene Hernandez, Marta Barrado, Ruth Vera, Fabio Efficace, Johannes M. Giesinger, the EORTC Quality of Life Group