1. Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea.
2. Department of Preventive Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea.
3. Department of Family Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea.
4. Department of Dermatology, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Dermatology, Kyungpook National University College of Medicine, Daegu, Korea.
6. Department of Dermatology, Pusan National University College of Medicine, Busan, Korea.
7. Department of Dermatology, The Catholic University of Korea College of Medicine, Seoul, Korea.
8. Department of Dermatology, Hanyang University College of Medicine, Seoul, Korea.
9. Department of Dermatology, Soonchunhyang University College of Medicine, Cheonan, Korea.
10. Department of Dermatology, Hallym University College of Medicine, Seoul, Korea.
11. Department of Dermatology, Chonnam National University College of Medicine, Gwangju, Korea.