1. Laboratory of Biosensors and Bioelectronics, ETH Zurich, Gloriastrasse 35, 8092 Zurich, Switzerland
2. Tissue Electronics, Istituto Italiano di Tecnologia, 80125 Naples, Italy
3. Department of Chemistry, Stanford University, Stanford, California 94305-4401, United States
4. Complex Materials, Department of Materials, ETH Zürich, 8093 Zürich, Switzerland