1. Department of Dermatology, Seoul National University College of Medicine, Seoul, Korea.
2. Acne Research Laboratory, Seoul National University Hospital, Seoul, Korea.
3. Department of Dermatology, College of Medicine, Kyunghee University, Seoul, Korea.
4. Department of Dermatology, College of Medicine, Korea University, Seoul, Korea.
5. Department of Dermatology, Sungkyunkwan University School of Medicine, Seoul, Korea.
6. Department of Dermatology, Hanyang University Medical College, Seoul, Korea.
7. Department of Dermatology, Hallym University Medical College, Anyang, Korea.