Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy. Division of Endocrinology and Diabetes, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy. Department of Experimental Medicine, University of Rome "Tor Vergata", Rome, Italy. Division of Respiratory Medicine, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy. Department of Biomedicine and Prevention, University of Rome "Tor Vergata", Rome, Italy. Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy. d.lauro@med.uniroma2.it. Division of Endocrinology and Diabetes, University Hospital Fondazione Policlinico Tor Vergata, Rome, Italy. d.lauro@med.uniroma2.it.