1. Department of Gastroenterology and Hepatology, Kangwon National University Hospital, Kangwon National University School of Medicine, Chuncheon, Korea.
2. Department of Dermatology, Kangwon National University Hospital, Kangwon National University School of Medicine, Chuncheon, Korea.
3. Department of Applied Statistics, Korea University Sejong Campus, Sejong, Korea.
4. Division of Allergy and Clinical Immunology, Kangwon National University School of Medicine, Chuncheon, Korea.