1. Department of Internal Medicine II; Division of Gastroenterology and Hepatology; Klinikum Hanau; Academic Teaching Hospital of the Medical Faculty of the Goethe University Frankfurt/Main; Hanau Germany
2. Department of Internal Medicine II; Division of Gastroenterology, Hepatology and Infectious Diseases; Friedrich Schiller University Jena; Jena Germany
3. Department of Medicine I; University Medical Center Hamburg Eppendorf; Hamburg Germany
4. Institute of Industrial, Environmental and Social Medicine; Medical Faculty; Goethe University Frankfurt/Main; Frankfurt Germany