1. Department of Biochemistry, Viale Taramelli 3/b 27100 Pavia, Italy.
2. Department of Biochemistry, Viale Taramelli 3/b 27100 Pavia, Italy and Center for Tissue Engineering (CIT), Via Ferrata 1, 27100 Pavia, Italy.
3. Research Unit on Implant Infections, Rizzoli Orthopaedic Institute, Via di Barbiano 1/10, 40136 Bologna, Italy and Experimental Pathology Department, University of Bologna, Via S. Giacomo 14, 40126 Bologna, Italy.