1. Division of Cardiology, Department of Internal MedicineKangwon National University School of Medicine Chuncheon South Korea
2. Department of CardiologyChonnam National University Hospital Gwangju South Korea
3. Division of CardiologySeverance Cardiovascular Hospital, Yonsei University College of Medicine South Korea
4. Division of CardiologyInje University College of Medicine, Haeundae Paik Hospital Busan South Korea