1. St. John's Institute of Dermatology; King's College London; London U.K
2. Department of Dermatology; National Cheng Kung University Hospital; College of Medicine; National Cheng Kung University; Tainan Taiwan
3. As'ad Al-Hamad Dermatology Center; Al-Sabah Hospital; Kuwait
4. Viapath, St Thomas's Hospital; London U.K