Kaiser, Matthias J., Stefania Bandinelli, and Bruno Lunenfeld. 2010. “Frailty and the Role of Nutrition in Older People A Review of the Current Literature”. Acta Biomedica Atenei Parmensis 81 (1Suppl): 37-45. https://mattioli1885journals.com/index.php/actabiomedica/article/view/4633.