1. Consiglio Nazionale delle Ricerche ‐ Istituto per lo Studio dei Materiali Nanostrutturati (CNR‐ISMN) Bologna Italy
2. Instituto de Nanociencia de Aragon (INA), Universidad de Zaragoza Zaragoza Spain
3. Present address: Max Delbrück Center for Molecular Medicine in the Helmholtz Association Berlin Germany
4. National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki Japan
5. Materials Science Factory Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC Madrid Spain
6. Present address: School of Industrial Engineering Purdue University West Lafayette Indiana U.S.A.
7. Department of Life Sciences Università di Modena e Reggio Emilia Modena Italy
8. Center for Translational Neurophysiology‐Istituto Italiano di Tecnologia Ferrara Italy