1. Department of Internal Medicine, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
2. Department of Medicine, The Graduate School of Yonsei University, Yonsei University College of Medicine, Seoul, Korea
3. Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
4. Department of Internal Medicine, Inha University Hospital, Inha University College of Medicine, Incheon, Korea
5. Utah-Inha Drug Delivery System & Advanced Therapeutics Research Center, Incheon, Korea
6. Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea