1. Krebs Institute for Biomolecular Research and Department of Information Studies, University of Sheffield, 211 Portobello Street, Sheffield S1 4DP, United Kingdom
2. Discngine, 102 Avenue Gaston Roussel, 93230 Romainville, France
3. Chemical and Analytical Sciences, Sanofi-Aventis, 94400 Vitry-sur-Seine, France