1. Institute for Clinical & Experimental Surgery; Saarland University; 66421 Homburg/Saar Germany
2. INM-Leibniz Institute for New Materials; 66123 Saarbrücken Germany
3. Department of Trauma, Hand, and Reconstructive Surgery; Saarland University; 66421 Homburg/Saar Germany
4. Institute of Medical Microbiology and Hygiene; Saarland University; 66421 Homburg/Saar Germany