1. CNR-NANO; Istituto Nanoscienze; Euromediterranean Center for Nanomaterial Modelling and Technology (ECMT); via Arnesano I 73100 Lecce Italy
2. CNR-NANO; Istituto Nanoscienze; Centro S3, via Campi 213 I-41125 Modena Italy
3. Department of Materials Science and Engineering; Frederick Seitz Materials Research Laboratory; Beckman Institute for Advanced Science; University of Illinois at Urbana-Champaign; Urbana IL 61801 USA
4. The David H. Koch Institute for Integrative Cancer Research; Massachusetts Institute of Technology; Cambridge MA 02139 USA
5. Harvard Society of Fellows; Harvard University; Cambridge MA 02138 USA
6. Department of Civil and Environmental Engineering and Department of Mechanical Engineering; Northwestern University; Evanston IL 60208 USA
7. Department of Engineering Mechanics; Center for Mechanics and Materials; Tsinghua University; Beijing 100084 China
8. College of Aerospace and Civil Engineering; Harbin Engineering University; Harbin 150001 China
9. Dipartimento di Matematica e Fisica “Ennio De Giorgi”; Università del Salento; via Arnesano I-73100 Lecce Italy