1. Department of Operative Dentistry and Periodontology; Saarland University Medical Centre; Homburg/Saar Germany
2. Centre of Experimental Orthopaedics; Saarland University; Homburg/Saar Germany
3. Institute für Experimental Surgery, Department of Surgery; Saarland University Medical Centre; Homburg/Saar Germany
4. Department of Orthopaedic Surgery; Saarland University Medical Centre; Homburg/Saar Germany