1 Department of Experimental and Clinical Medicine, Geriatric Intensive Care Unit, University of Florence, Largo Brambilla, 3, Florence 50134, Italy. Electronic address: stefano.fumagalli@unifi.it.
2 Direzione Generale Cura della Persona, Salute e Welfare, Regione Emilia-Romagna, Bologna, Italy.
3 Department of Experimental and Clinical Medicine, Geriatric Intensive Care Unit, University of Florence, Largo Brambilla, 3, Florence 50134, Italy.
4 Internal, Vascular and Emergency Medicine, University of Perugia, Italy.