1. St John's Institute of Dermatology; Division of Genetics and Molecular Medicine; King's College London; London U.K
2. Dermatological Sciences; Institute of Cellular Medicine; Newcastle University; Newcastle upon Tyne U.K
3. Department of Gastroenterology; Guy's and St Thomas' NHS Foundation Trust; London U.K
4. Department of Cellular Pathology; UCL Medical School; Royal Free Campus London U.K
5. St John's Institute of Dermatology; Guy's and St Thomas' NHS Foundation Trust; London U.K