1. National Skin Centre, 1 Mandalay Road, Singapore 308205, Singapore
2. Department of Dermatology, Barts Health NHS Trust, London E11 1NR, UK
3. Queen Mary University, London E1 4NS, UK
4. Department of Dermatology and Venereology, University Hospital of Zurich, 8091 Zurich, Switzerland
5. Faculty of Medicine, University of Zurich, 8006 Zurich, Switzerland
6. National Skin Centre, Skin Research Institute of Singapore, 1 Mandalay Road, Singapore 308205, Singapore