1. Committee Established for ERCP Guidelines on Radiological Protection, Korean Society of Pancreatobiliary Disease
2. Department of Internal Medicine, Eulji University Eulji-General Hospital, Seoul, Korea.
3. Department of Internal Medicine, Sungkyunkwan University College of Medicine, Samsung Medical Center, Seoul, Korea.
4. Department of Internal Medicine, Korea University Medical Center, Guro-Hospital, Seoul, Korea.
5. Department of Internal Medicine, The Research Institute of Clinical Medicine, Chonbuk National University Medical School, Jeonju, Korea.