1Division of Cardiology, Department of Internal Medicine, Dong-Eui Medical Center, Busan, Korea
2Division of Cardiology, Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea
3Division of Cardiology, Department of Internal Medicine, Daegu Veterans Hospital, Daegu, Korea
4Division of Cardiology, Department of Internal Medicine, Pohang SM Christianity Hospital, Pohang, Korea
5Division of Cardiology, Department of Internal Medicine, Dongguk University Gyeongju Hospital, Gyeongju, Korea
6Department of Emergency Medicine, Yeungnam University Medical Center, Daegu, Korea
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