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1Department of Surgery, Seoul St. Mary’s Hospital, College of Medicine, Catholic University of Korea, Seoul, Korea
2Division of Statistics, Medical Research Collaborating Center, Seoul National University Bundang Hospital, Seongnam, Korea
3Department of Radiology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
4Department of Internal Medicine, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
©2014, Korean Society of Epidemiology
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