Contoli, Benedetta, Patrizia Carrieri, Maria Masocco, Luana Penna, Alberto Perra, and PDA Study Group. 2017. “PASSI d’Argento (Silver Steps): The Main Features of the New Nationwide Surveillance System for the Ageing Italian Population, Italy 2013-2014”. Annali dell’Istituto Superiore Di Sanità 52 (4). Rome, IT:536-42. https://annali.iss.it/index.php/anna/article/view/342.