1. Department of Dermatology; Seoul St. Mary's Hospital; College of Medicine; The Catholic University of Korea; Seoul Korea
2. Department of Biostatistics; College of Medicine; The Catholic University of Korea; Seoul Korea
3. Department of Family Medicine; St. Vincent's Hospital; College of Medicine; The Catholic University of Korea; Seoul Korea
4. Department of Dermatology; Uijeongbu St. Mary's Hospital; College of Medicine; The Catholic University of Korea; Seoul Korea