1. Department of Dermatology; Chung-Ang University College of Medicine; Seoul Korea
2. Department of Dermatology; Seoul National University College of Medicine; Seoul Korea
3. Acne & Rosacea Research Laboratory; Seoul National University Hospital; Seoul Korea
4. Department of Dermatology; Seoul St Mary's Hospital; Catholic University of Korea; Seoul Korea
5. Department of Dermatology; Korea University College of Medicine; Seoul Korea
6. Department of Dermatology; National Medical Center; Seoul Korea
7. Department of Dermatology; College of Medicine; Eulji University; Seoul Korea