1 Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Medical University of Vienna, Vienna, Austria; Quality Assurance Working Group, Austrian Society of Gastroenterology and Hepatology, Vienna, Austria.
2 Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Medical University of Vienna, Vienna, Austria; Quality Assurance Working Group, Austrian Society of Gastroenterology and Hepatology, Vienna, Austria. Electronic address: [email protected].