1 Department of Abdominal, Transplant, Thoracic and Vascular Surgery, University Hospital of Leipzig, Liebigstrasse 20, D-04103, Leipzig, Germany. yusef.moulla@medizin.uni-leipzig.de.
2 Integrated Research and Treatment Center (IFB) Adiposity Diseases, Leipzig, Germany. yusef.moulla@medizin.uni-leipzig.de.
3 Department of Abdominal, Transplant, Thoracic and Vascular Surgery, University Hospital of Leipzig, Liebigstrasse 20, D-04103, Leipzig, Germany.
4 Integrated Research and Treatment Center (IFB) Adiposity Diseases, Leipzig, Germany.
5 Clinic for Gastroenterology, Department of Internal Medicine, University Hospital of Leipzig, Liebigstrasse 20, D-04103, Leipzig, Germany.