Galluzzo, L.; O’Caoimh, R.; Rodríguez-Laso, Ángel; Beltzer, N.; Hylen Ranhoff, A.; Van der Heyden, J.; Lamprini-Koula, M.; Ciutan, M.; López-Samaniego, L.; Liew, A. Incidence of Frailty: A Systematic Review of Scientific Literature from a Public Health Perspective. Ann Ist Super Sanità 2018, 54, 239-245.