1. Department of Dermatology Seoul National University Hospital SeoulKorea
2. Public Healthcare Center Seoul National University Hospital SeoulKorea
3. Department of Health Policy and Management Seoul National University College of Medicine SeoulKorea
4. HIRA Research Institute, Health Insurance Review & Assessment Service WonjuKorea
5. Graduate School of Public Health Seoul National University SeoulKorea
6. Department of Internal Medicine and Liver Research Institute Seoul National University College of Medicine SeoulKorea
7. Laboratory of Intestinal Mucosa and Skin Immunology SeoulKorea
8. Department of Dermatology SMG‐SNU Boramae Medical Center Seoul Korea