1 Department of Internal Medicine III and Comprehensive Cancer Center, Klinikum Grosshadern, Ludwig-Maximilians-University of Munich, D-81377 Munich, Germany.
2 Department of Pathology, Ludwig-Maximilians-University of Munich, D-81377 Munich, Germany.
3 Department of Internal Medicine II, Klinikum Rechts der Isar, Technical University of Munich, D-81377 Munich, Germany.