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1Division of Endocrinology and Metabolism, Department of Internal Medicine, Keimyung University Dongsan Hospital, Keimyung University School of Medicine, Daegu, Korea
2Research and Analysis Team, National Health Insurance Service Ilsan Hospital, Goyang, Seoul, Korea
3Research Institute of National Health Insurance Service Ilsan Hospital, Goyang, Seoul, Korea
4Division of Endocrinology and Metabolism, Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Seoul, Korea
5Division of Endocrinology and Metabolism, Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
6Department of Endocrinology and Metabolism, Ajou University School of Medicine, Suwon, Korea
7Seattle Epidemiologic Research and Information Center, VA Puget Sound Health Care System, University of Washington, Seattle, WA, USA
8Department of Medicine, University of Washington, Seattle, WA, USA
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