1Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
2Institute of Endocrine Research, Yonsei University College of Medicine, Seoul, Korea.
3Division of Endocrinology and Metabolism, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
4Department of Internal Medicine, Wonkwang University Hospital, Wonkwang University School of Medicine, Iksan, Korea.
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