1. Division of Dermatology, Department of Medicine, National University Hospital, Singapore.
2. Department of Pathology, National University Hospital, Singapore.
3. Department of Pathology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
4. Department of Dermatology and Lübeck Institute for Experimental Dermatology (LIED), University of Lübeck, Lübeck, Germany.
5. Department of Dermatology, University of Lübeck, Lübeck, Germany.
6. Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.