1. Division of Bioorganic Chemistry, School of Pharmacy, Saarland University, D-66123 Saarbrucken, Germany
2. Department of Communication and Economics, University of Modena and Reggio Emilia, 42121 Reggio Emilia, Italy
3. VTT Technical Research Centre of Finland Ltd., 70210 Kuopio, Finland
4. Department of Philosophy “Piero Martinetti”, University of Milan, 20122 Milan, Italy