1 Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria.
2 Department of Internal Medicine I, Klinikum Wels Grieskirchen, Wels, Austria.
3 Red Cross Blood Transfusion Center, Linz, Austria.
4 Department of Gastroenterology and Hepatology, Medical University of Innsbruck, Innsbruck, Austria.
5 Department of Pediatrics II, Medical University of Innsbruck, Innsbruck, Austria.
6 Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria. peter.ferenci@meduniwien.ac.at.