Collaborators: COVID-LT group: Michele Colledan (Department of Surgery, General Surgery and Abdominal Transplant Unit, "Papa Giovanni XXIII" Hospital, Bergamo, Italy), Stefano Fagiuoli (Gastroenterology and Transplant Hepatology, “Papa Giovanni XXIII” Hospital, Bergamo, Italy), Stefania Camagni (Gastroenterology and Transplant Hepatology, “Papa Giovanni XXIII” Hospital, Bergamo, Italy), Jean Delwaide (Division of Hepato-Gastroenterology and Digestive Oncology, University Hospital of Liege, Liege, Belgium), Giovanni Vitale (Department of Organ Failures and Transplantation, University Hospital of Bologna, Policlinico S. Orsola-Malpighi, Bologna, Italy), Darius Moradpour (Division of Gastroenterology and Hepatology, Centre Hospitalier Universitaire Vaudois, University of Lausanne, Lausanne, Switzerland), Manuel Pascual (Transplantation Center, Centre Hospitalier Universitaire Vaudois, University of Lausanne, Lausanne, Switzerland), Gloria Allegrini (Department of Gastroenterology, University Hospital Ancona, Polytechnic University of Marche, Ancona, Italy), Fabio Tarsetti (Department of Gastroenterology, University Hospital Ancona, Polytechnic University of Marche, Ancona, Italy), Ugo Giustizieri (Department of Surgery, General Surgery and Abdominal Transplant Unit, "Papa Giovanni XXIII" Hospital, Bergamo, Italy), Loredana Rota (Gastroenterology and Transplant Hepatology, “Papa Giovanni XXIII” Hospital, Bergamo, Italy), Florent Artru (Division of Gastroenterology and Hepatology, Centre Hospitalier Universitaire Vaudois, University of Lausanne, Lausanne, Switzerland), Anne-Catherine Saouli (Transplantation Center, Centre Hospitalier Universitaire Vaudois, University of Lausanne, Lausanne, Switzerland), Patrizia Burra (Multivisceral Transplant Unit, Department of Surgery, Oncology, Gastroenterology, Padua University Hospital, Padua, Italy), Martina Gambato (Multivisceral Transplant Unit, Department of Surgery, Oncology, Gastroenterology, Padua University Hospital, Padua, Italy), Irene Scalera (Department of Hepato-Biliary Surgery and Liver Transplantation, “Cardarelli” Hospital of Naples, Naples, Italy), Ioannis Petridis (Department for the Treatment and Study of Abdominal Diseases and Abdominal Transplantation, IRCCS-ISMETT (Istituto di Ricovero e Cura a Carattere Scientifico - Istituto Mediterraneo per i Trapianti e Terapie ad alta specializzazione), UPMC (University of Pittsburgh Medical Center) Italy, Palermo, Italy), Hugo Pinto Marques (Hepato-Biliary-Pancreatic and Transplantation Center, Curry Cabral Hospital, Lisbon's Central Hospitals and University Center, NOVA Medical School, Lisboa, Portugal), Martin-Walter Welker(Department of Internal Medicine 1, University Hospital Frankfurt, Goethe University, Frankfurt, Germany).