1. Department of Orthopaedic Surgery, OE 8893; Hannover Medical School; Hannover Germany
2. Department of Orthopaedic Surgery (Annastift), OE 6270; Hannover Medical School; Hannover Germany
3. Biochemistry and Tumour Biology Laboratory, Department of Obstetrics and Gynecology, OE 6411; Hannover Medical School; Hannover Germany