1Department of Internal Medicine, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2Department of Medical Statistics, College of Medicine, The Catholic University of Korea, Seoul, Korea.
3Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
4Department of Radiology, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
5Department of Internal Medicine, St. Paul's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
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