1. Department of Dermatology, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea.
3. Department of Dermatology, Chungnam National University Sejong Hospital, Sejong, Korea.
4. Department of Dermatology, College of Medicine, Dankook University, Cheonan, Korea.