1Institute of Musculoskeletal Medicine, University Münster, Münster, Germany
2Department of Trauma, Hand and Reconstructive Surgery University Hospital Münster, Münster, Germany
3Institute of Pathology, University Hospital of Cologne, Cologne, Germany
4Institute of Physiology II, University Münster, Münster, Germany
5Center for Laboratory Medicine, University Hospital Münster, Münster, Germany