1. Department of Clinical and Experimental Medicine. University of Insubria, Italy
2. Istituto Superiore di Sanità, Roma, Italy
3. Department of Biostatistics, University of North Carolina at Chapel Hill, USA
4. Clinica Medica, Università Milano-Bicocca, Italy
5. Istituto di Ricerca a Carattere Scientifico IRCCS Multimedica, Sesto San Giovanni (Milano), Italy
6. Research Center for Public Health, University of Milano-Bicocca, Italy