1. Laboratories of Biophysics and Nanotechnology, Department of Experimental Medicine, University of Genova, Via A. Pastore, 3, 16132 Genova, Italy
2. Fondazione EL.B.A–Nicolini, Largo Redaelli, 7, 24020 Pradalunga, Bergamo, Italy
3. The European Synchrotron, ESRF, CS40220, F-38043 Grenoble Cedex 9, France