Author correction : Graphene active sensor arrays for long-term and wireless mapping of wide frequency band epicortical brain activity - Garcia Cortadella, Ramon (Institut Català de Nanociència i Nanotecnologia) ; Schwesig, G. (Ludwig-Maximilians-Universität München. Bernstein Center for Computational Neuroscience Munich) ; Jeschke, C. (Multi Channel Systems GmbH) ; Illa, Xavi (Institut de Microelectrònica de Barcelona) ; Gray, Anna L. (University of Manchester. National Graphene Institute. Nanomedicine Lab) ; Savage, S. (University of Manchester. National Graphene Institute. Nanomedicine Lab) ; Stamatidou, E. (University of Manchester. National Graphene Institute. Nanomedicine Lab) ; Schiessl, I. (University of Manchester. Division of Neuroscience and Experimental Psychology) ; Masvidal Codina, Eduard (Institut de Microelectrònica de Barcelona) ; Kostarelos, Kostas (Institut Català de Nanociència i Nanotecnologia) ; Guimerà Brunet, Anton (Institut de Microelectrònica de Barcelona) ; Sirota, Anton (Ludwig-Maximilians-Universität München. Bernstein Center for Computational Neuroscience Munich) ; Garrido, Jose (Institut Català de Nanociència i Nanotecnologia)