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1. Ewha Womans University, School of Medicine, Seoul, Korea, 2. Samsungchangwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea, 3. Chosun University Hospital, College of Medicine, Gwangju, Korea, 4. Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea, 5. Asan Medical Center, University of Ulsan College of Medicine
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