1. Division of Cardiology, Department of Internal Medicine, Keimyung University Dongsan Hospital, Keimyung University School of Medicine, Daegu, Korea.
2. Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea.
3. Division of Cardiology, Department of Internal Medicine, Inha University College of Medicine, Incheon, Korea.
4. Division of Cardiology, Yeungnam University Medical Center, Daegu, Korea.
5. Division of Cardiology, Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea.
6. Division of Cardiology, Gachon University Gil Medical Center, Incheon, Korea.
7. Department of Internal Medicine, Yonsei University Gangnam Severance Hospital, Seoul, Korea.
8. Division of Physiology, Department of Biomedical Laboratory, Daegu Health College, Daegu, Korea.
9. University of Texas Health, Houston, TX, USA.