1. Barcaccia B, Esposito G, Matarese M, Bertolaso M, Elvira M, De Marinis MG. Defining quality of life: a wild-goose chase? Eur J Psychol. 2013;9:185–203.
2. WHO. WHOQOL: measuring quality of life. https://www.who.int/mental_health/media/68.pdf. 1997. Accessed 9 Nov 2020.
3. Karnofsky DA, Burchenal JH. The Clinical Evaluation of Chemotherapeutic Agents in Cancer. In: MacLeod CM, editor, Evaluation of chemotherapeutic agents. New York: Columbia University Press; 1949. p. 196.
4. Spitzer WO, Dobson AJ, Hall J, et al. Measuring the quality of life of cancer patients: a concise QL-Index for use by physicians. J Chronic Dis. 1981;34(12):585–97.
5. US Department of Health and Human Sciences, Centers for Disease Control and Prevention. Measuring healthy days: population assessment of health-related quality of life. Atlanta, Georgia: CDC; 2000. Available at: https://www.cdc.gov/hrqol/pdfs/mhd.pdf.