1 Department of Medical and Surgical Sciences and Advanced Technologies "GF Ingrassia", University of Catania, Catania, Italy; International Clinical Research Center (FNUSA-ICRC), St'Anne University Hospital, Brno, Czech Republic.
2 Institute for Liver and Digestive Health, Division of Medicine, University College London (UCL), London, UK.
3 International Clinical Research Center (FNUSA-ICRC), St'Anne University Hospital, Brno, Czech Republic; Institute for Liver and Digestive Health, Division of Medicine, University College London (UCL), London, UK. Electronic address: manlio.vinciguerra@fnusa.cz.