1 University of Manchester Medical School, Manchester, UK.
2 Department of Dermatology, Jaber Al-Ahmed Hospital, Kuwait city, Kuwait.
3 Department of Dermatology, Aalborg University Hospital, Aalborg, Denmark.
4 Mid Cheshire NHS Foundation Trust, Macclesfield, UK.
5 Dermatological Surgery & Laser Unit, St John's Institute of Dermatology, Guy's Hospital Cancer Centre, Guy's and St Thomas' NHS Foundation Trust, Great Maze Pond, London, UK.