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  • The EORTC Quality of Life Core Questionnaire EORTC-QLQ-C30 [31] measures cancer-related quality of life reliably and with good validity using five functional scales (physical, role, cognitive, emotional, social; in the MeLa data, Cronbach´s α = .80/.90/.68/.89/.85 in order of the previous list), three symptom scales (pain, fatigue, nausea/vomiting; in the MeLa data set Cronbach´s α = .89/.85/.33), a global health and quality of life scale, and six single items assessing additional symptoms commonly reported by patients (e.g. appetite loss, sleep disturbance) as well as the perceived financial impact of the disease and treatment.
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