1. Department of Oral Medicine, Pathology and Immunology, King's College London Dental Institute, Kings College London, London, UK
2. Department of Dermatology, Eberhard Karl University, University of Tuebingen, Tuebingen, Germany
3. Department of Genitourinary and HIV Medicine, Guy's and St Thomas's Hospital Trust, St Thomas' Hospital, London, UK
4. Friedrich Schiller University Jena and Department of Microbial Pathogenicity Mechanisms, Leibniz Institute for Natural Product Research and Infection Biology – Hans Knoell Institute Jena (HKI), Beutenbergstraße 11a, D-07745 Jena, Germany