1Department of Cardiology in Internal Medicine, Chungnam National University Hospital, Chungnam National University College of Medicine, Daejeon,
Korea
2Division of Cardiology, Department of Internal Medicine, Jeonbuk National University Medical School and Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju,
Korea
3Department of Cardiology in Internal Medicine, Chungnam National University Sejong Hospital, Sejong,
Korea
4Division of Statistics, Office of Information Security, Korea Institute of Toxicology, Daejeon,
Korea
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