1. The BioRobotics InstituteScuola Superiore Sant'Anna Viale Rinaldo Piaggio 34 56025 Pontedera (PI) Italy
2. Department of Civil and Environmental Engineering at Massachusetts Institute of Technology 77 Massachusetts Ave Cambridge MA 02139 USA
3. Department of ChemistryMaterials and Chemical Engineering “G. Natta”Politecnico di Milano Piazza Leonardo da Vinci 32 20133 Milan Italy
4. Institute of Nanotechnology (NANOTEC)National Research Council Via per Monteroni c/o Campus Ecotekne 73100 Lecce Italy
5. Department of Civil and Industrial EngineeringUniversity of Pisa Largo L. Lazzarino 2 56122 Pisa Italy