1. School of Public Health; University of Haifa; Haifa Israel
2. Liver Unit; Department of Gastroenterology; Tel Aviv Medical Center; Tel-Aviv Israel
3. Division of Gastroenterology; Ospedale di Acireale; Azienda Sanitaria Provinciale di Catania; Catania Italy
4. The Sackler Faculty of Medicine; Tel-Aviv University; Tel-Aviv Israel