1. Public Health Medical Service, Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea.
2. Institute of Health Policy and Management, Medical Research Center, Seoul National University, Seoul, Korea.
3. Department of Health Policy and Management, Graduate School of Public Health, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Dermatology, Seoul National University Hospital, Seoul, Korea.
5. Institute of Human-Environment Interface Biology, Seoul National University, Seoul, Korea.