1. Department of Oncology, Gastroenterology, Hepatology, Pulmonology and Infectious Diseases, University Cancer Center Leipzig (UCCL) Leipzig University Medical Center Leipzig Germany
2. Department of Oncology University Hospital of Pisa Pisa Italy
3. Institute for Medical Informatics, Statistics and Epidemiology (IMISE) Medical Faculty of the University Leipzig Leipzig Germany
4. SRH Clinic Naumburg Naumburg Germany
5. Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics Leipzig University Medical Center Leipzig Germany