1. St John's Institute of Dermatology; King's College London; London U.K.
2. Department of Dermatology, Venereology and Andrology; Faculty of Medicine; Alexandria University; Alexandria Egypt
3. Department of Dermatology; College of Medicine; National Cheng Kung University; Tainan Taiwan
4. Institute of Clinical Medicine; College of Medicine; National Cheng Kung University; Tainan Taiwan
5. Department of Dermatology; Hiroshima University; Hiroshima Japan