1 Faculty of Medicine and University Hospital of Cologne, Department of Gastroenterology and Hepatology, University of Cologne, Cologne, Germany. Electronic address: philipp.kasper@uk-koeln.de.
2 Faculty of Medicine and University Hospital of Cologne, Department of Gastroenterology and Hepatology, University of Cologne, Cologne, Germany.
3 Faculty of Medicine and University Hospital of Cologne, Department of Gastroenterology and Hepatology, University of Cologne, Cologne, Germany. Electronic address: gabriel.allo@uk-koeln.de.