1. Department of Physics, University of Calabria, Rende, Italy
2. Fondazione G.B. Bietti IRCCS, Rome, Italy
3. Biomedical Atomic Force Microscopy Laboratory, Department of Biomedical Engineering, University of Miami College of Engineering, Coral Gables, Florida, United States
4. Consiglio Nazionale delle Ricerche, Istituto per i Processi Chimico-Fisici (CNR-IPCF), Messina, Italy 5Vision Engineering Italy srl, Rome, Italy