Author information:
(1)Department of Gastroenterology, Hepatology and Endocrinology, Hannover 
Medical School, Hannover, Germany. Electronic address: 
vogel.arndt@mh-hannover.de.
(2)Department of Medical Oncology, West German Cancer Center, University 
Hospital Essen, Essen, Germany.
(3)Department of Internal Medicine I, University Hospital Tübingen, Tübingen, 
Germany.
(4)Department of Medical Oncology and Hematology, University Cancer Center 
Hamburg, University Hamburg-Eppendorf, Hamburg, Germany.
(5)Department of Hematology and Oncology, University Hospital Charité, Berlin, 
Germany.
(6)National Center for Tumor Diseases, University of Heidelberg, Heidelberg, 
Germany.
(7)Department of Gastroenterology, Johannes-Gutenberg University, Mainz, 
Germany.
(8)Institute of Pathology, University Hospital and National Center for Tumor 
Diseases Heidelberg, Germany; Institute of Pathology, Technical University 
Munich, Munich, Germany.
(9)Institute of Pathology, University Hospital and National Center for Tumor 
Diseases Heidelberg, Germany.
(10)Interdisziplinären Tumorzentrum Mannheim, Mannheim, Germany.
(11)Department of Internal Medicine, University Hospital Regensburg, Germany, 
Regensburg, Germany.
(12)2nd Department of Internal Medicine, Technical University, Munich, Germany.
(13)Department of Gastroenterology, Philipps-University Marburg, Marburg, 
Germany.
(14)Department of Gastroenterology and Hepatology, University of Cologne, 
Cologne, Germany.
(15)Department of Medicine II, University Hospital Freiburg, Freiburg, Germany.
(16)Department of Gastroenterology and Oncology, Klinikum Esslingen, Esslingen, 
Germany.
(17)Department of Hematology, Oncology and Palliative Care, Klinikum Magdeburg, 
Magdeburg, Germany.
(18)Lindenallee 53b, 59174 Kamen, Germany.
(19)Gottfried Wilhelm Leibniz University Hannover, Center for Health Economics 
Research Hannover, Germany.
(20)Institute of Pathology, University Hospital and National Center for Tumor 
Diseases Heidelberg, Germany; Institute of Pathology, Technical University 
Munich, Munich, Germany; German Cancer Consortium (DKTK), Partner Site Munich, 
Germany.
(21)Cancer Center Reutlingen, Reutlingen, Germany.