1. Department of Dermatology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea;
2. Department of Dermatology, Seoul National University Bundang Hospital, Seoul, Korea;
3. Department of Dermatology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea;
4. Department of Dermatology, Hanyang University College of Medicine, Seoul, Korea