1. Orthopaedic Department, Tübingen University Hospital, Hoppe-Seyler-Str. 3, D-72076 Tübingen, Germany.
2. Institute of Pathology, Tübingen University Hospital, Liebermeisterstr. 8, D-72076 Tübingen, Germany.
3. Department of Haematology, Oncology and Immunology Tübingen University Hospital, Ottfried-Müller-Str. 10, D-72076 Tübingen, Germany.