1. Department of Dermatology; University Hospital Regensburg; Franz-Josef-Strauss-Allee 11 93053 Regensburg Germany
2. Institute of Microbiology; University of Regensburg; Regensburg Germany
3. TriOptoTec GmbH; Am Biopark 13 Regensburg Germany
4. Department of Organic Chemistry; University of Regensburg; Regensburg Germany