1Department of Internal Medicine, Ewha University College of Medicine, Seoul, Korea.
2Department of Internal Medicine, St. Vincent's Hospital, The Catholic University College of Medicine, Seoul, Korea.
3Department of Internal Medicine, Sungkyunkwan University School of Medicine, Seoul, Korea.
4Department of Internal Medicine, Guri Hospital, Hanyang University College of Medicine, Guri, Korea.
5Department of Internal Medicine, Ulsan University College of Medicine, Seoul, Korea.
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