1. INSERM, UMR-S 1121; Biomatériaux et Bioingénierie; 11, rue Humann 67085 Strasbourg Cedex France
2. Institut Charles Sadron (UPR22-CNRS); 23, rue du Loess 67034 Strasbourg France
3. Department of Chemistry and Biochemistry; The Florida State University; Tallahassee FL 32306 USA