1. Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
2. Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER-BBN), Campus UAB, 08193 Bellaterra, Spain
3. Consiglio Nazionale delle Ricerche (CNR), Instituto per la Microelettronica e Microsistemi (IMM), 40129 Bologna, Italy
4. Institució Catalana de Recerca i Estudis Avançats (ICREA), 08193 Bellaterra, Spain