1. Helmholtz-Institute for Biomedical Engineering-Biointerface Laboratory; RWTH Aachen University; Germany
2. Laboratory for Biomaterials, Materials Research Centre; Interdisciplinary Bio-Engineering Program; Indian Institute of Science; Bangalore 560012 India
3. Institute of Inorganic Chemistry; RWTH Aachen University; Germany
4. Medical Microbiology; RWTH Aachen University; Germany
5. Electron Microscopy Facility; Medical Faculty; RWTH Aachen University; Germany