R.J. Hay - 1Institute of Dermatology, St. Thomas's Hospital, London, UK
E.S. Mahgoub - 1Institute of Dermatology, St. Thomas's Hospital, London, UK
G. Leon - 1Institute of Dermatology, St. Thomas's Hospital, London, UK
S. Al-Sogair - 1Institute of Dermatology, St. Thomas's Hospital, London, UK
O. Welsh - 1Institute of Dermatology, St. Thomas's Hospital, London, UK