1 Istituto Superiore di Sanità, 00161 Rome, Italy.
2 Department of Medicine, University of Udine, 33100 Udine, Italy.
3 Accreditation and Quality Unit, Friuli Centrale Healthcare University Trust, 33100 Udine, Italy.
4 School of Medicine, University Vita-Salute San Raffaele, 20132 Milan, Italy.
5 Scientific Communication Unit, Istituto Superiore di Sanità; 00161 Rome, Italy.
6 Department of Medical and Surgical Sciences and Advanced Technologies "G.F.Ingrassia", Section of Hygiene and Preventive Medicine, University of Catania, 95125 Catania, Italy.