1. Foreman KJ, Marquez N, Dolgert A, Fukutaki K, Fullman N, McGaughey M, et al. Forecasting life expectancy, years of life lost, and all-cause and cause-specific mortality for 250 causes of death: reference and alternative scenarios for 2016-40 for 195 countries and territories. Lancet. 2018;392:2052–90.
2. Cardano M. La ricerca qualitativa. Bologna: Il Mulino; 2011.
3. Mortari L, Ghirotto L. Metodi della ricerca educativa. Roma: Carocci; 2019.
4. Denzin NK, Lincoln YS. Introduction: entering the field of qualitative research. In: Denzin NK, Lincoln YS, editors. The landscape of qualitative research. Theories and issues. Thousand Oaks, CA: Sage; 1998. p. 1–34.
5. Polit DF, Beck CT. Essentials of nursing research: appraising evidence for nursing practice. 8th ed. Philadelphia: Lippincott; 2013.