1. Department of Dermatology; St. Vincent's Hospital; College of Medicine; The Catholic University of Korea; Suwon Korea
2. Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
3. Kangskin Dermatology Clinic; Seoul Korea
4. Department of Dermatology; International St. Mary's Hospital; Catholic Kwandong University College of Medicine; Incheon Korea