1. Nanomaterials for Bioimaging Group (NanoBIG) Departamento de Física de Materiales Universidad Autónoma de Madrid C/Francisco Tomás y Valiente 7 Madrid 28049 Spain
2. Madrid Institute for Advanced Studies in Nanoscience (IMDEA Nanociencia) C/Faraday 9 Madrid 28049 Spain
3. Nanobiotechnology Unit Associated to the National Center for Biotechnology (CNB-CSIC-IMDEA) Madrid 28049 Spain
4. Instituto Ramón y Cajal de Investigación Sanitaria Hospital Ramón y Cajal Ctra. Colmenar km. 9,100 Madrid 28034 Spain