[1] University of Cologne,Department of General, Visceral, Cancer and Transplantation Surgery, Faculty of Medicine and University Hospital Cologne
[2] Department of Pediatrics,Institute of Medical Statistics and Computational Biology, Faculty of Medicine and University Hospital Cologne
[3] University of Cologne,Department I of Internal Medicine, Faculty of Medicine and University Hospital Cologne
[4] University of Cologne,Center for Esophageal Diseases
[5] Elisabeth-Krankenhaus Essen,Else Kröner Forschungskolleg Cologne “Clonal Evolution in Cancer”
[6] Faculty of Medicine and University Hospital,undefined