1. Laboratoire de Physique et Chimie Théoriques, Université de Lorraine & CNRS, Boulevard des Aiguillettes, BP 70239 54506 Vandoeuvre-lès-Nancy Cedex, France
2. Department of Neuroscience and Rehabilitation, Section of Physiology, University of Ferrara, via L. Borsari 46, I-44121 Ferrara, Italy
3. Department of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, via Fossato di Mortara 19, I-44121 Ferrara, Italy
4. Department of Physics and Earth Science, University of Ferrara, Via Saragat, 1, I-44122 Ferrara, Italy