1 Liver and anti-viral unit, Division of Digestive Diseases, Department of Metabolism, Digestion and Reproduction, Imperial college London, London, United Kingdom. Electronic address: r.forlano@imperial.ac.uk.
2 Liver and anti-viral unit, Division of Digestive Diseases, Department of Metabolism, Digestion and Reproduction, Imperial college London, London, United Kingdom; University of Milan, Milan, Italy.