1. Department of Dermatology, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Department of Preventive Medicine and Public Health, College of Medicine, The Catholic University of Korea, Seoul, Korea.
3. Department of Dermatology, Eunpyeong St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
4. Department of Dermatology, Korea University College of Medicine, Seoul, Korea.