1. Department of Internal Medicine, Inje University College of Medicine, Busan, Korea.
2. Division of Cardiology, Department of Internal Medicine, Maryknoll Medical Center, Busan, Korea.
3. Division of Biostatistics, Kyungpook National University School of Medicine, Daegu, Korea.
4. Paik Inje Memorial Institute for Clinical Medicine Research, Inje University College of Medicine, Busan, Korea.