1. Federal Institute for Materials Research and Testing (BAM), Richard-Willstätter-Straße 11, D-12489 Berlin, Germany
2. Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, D-12489 Berlin, Germany
3. Department of Biomedical Engineering, Chinese University of Hong Kong, Room 802, 8/F, William M.W. Mong Engineering Building, Sha Tin, Hong Kong Special Administrative Region (SAR), China
4. Technische Universität Berlin, Straße des 17. Juni 135, D-10623 Berlin, Germany