1. Research Centre on Public Health (CESP); University of Milan-Bicocca; Monza Italy
2. Department of Clinical Medicine and Surgery; University Federico II of Naples; Naples Italy
3. Department of Surgical and Interdisciplinary Medicine; University of Milan-Bicocca; Monza Italy
4. Department of Health Sciences, Centre of Biostatistics for Clinical Epidemiology; University of Milan-Bicocca; Monza Italy
5. Department of Hepatology and Liver Unit; Niguarda Hospital; Milan Italy
6. Liver Center & Section of Digestive Diseases, Department of Internal Medicine; Yale University School of Medicine; New Haven CT