Galluzzo, Lucia, Rónán O’Caoimh, Ángel Rodríguez-Laso, Nathalie Beltzer, Anette Hylen Ranhoff, Johan Van der Heyden, Maria Lamprini-Koula, et al. 2018. “Incidence of Frailty: A Systematic Review of Scientific Literature from a Public Health Perspective”. Annali dell’Istituto Superiore Di Sanità 54 (3). Rome, IT:239-45. https://annali.iss.it/index.php/anna/article/view/770.