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1Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea
2Department of Statistics and Actuarial Science, Soongsil University, Seoul, Korea
3Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea
4Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
5Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, Korea
6Department of Internal Medicine, Healthcare Research Institute, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Korea
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