1. Department of Dermatology; University Hospital of Wales; Heath Park Cardiff CF14 4XW U.K
2. Department of Dermatology; Prince Charles Hospital; Merthyr Tydfil U.K
3. Department of Histopathology; University Hospital of Wales; Heath Park Cardiff CF14 4XW U.K
4. Institute of Infection and Immunity; Cardiff University School of Medicine; Cardiff U.K