1. Department of Surgery, University Medical Center Mannheim, University of Heidelberg, Mannheim, Germany
2. Institute of Pathology, University Medical Center Mannheim, University of Heidelberg, Mannheim, Germany
3. Institute of Pathology, Kantonsspital Aarau, Aarau, Switzerland
4. First Department of Medicine, Division of Biostatistics, University Medical Center Mannheim, University of Heidelberg, Mannheim, Germany