1Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
2Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea.
3Division of Endocrinology and Metabolism, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
4Institute of Endocrine Research, Yonsei University College of Medicine, Seoul, Korea.
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