1. Department of Internal Medicine I, Ulm University Hospital, 89081 Ulm, Germany
2. Institute for Epidemiology and Medical Biometry, Ulm University, 89075 Ulm, Germany
3. Central Department of Clinical Chemistry, Ulm University Hospital, 89081 Ulm, Germany
4. Institute of Molecular Oncology and Stem Cell Biology, Ulm University Hospital, 89081 Ulm, Germany