AUTHOR=Hofmann Ulrich G. , Krüger Jürgen TITLE=The chronic challenge—new vistas on long-term multisite contacts to the central nervous system JOURNAL=Frontiers in Neuroengineering VOLUME=8 YEAR=2015 URL=https://www.frontiersin.org/journals/neuroengineering/articles/10.3389/fneng.2015.00003 DOI=10.3389/fneng.2015.00003 ISSN=1662-6443