1. Division of Cardiology, College of Medicine, Konyang University Hospital, Daejeon, Korea.
2. Division of Cardiology, Yokohama City University Medical Center, Yokohama, Japan.
3. Division of Cardiovascular Diseases, Mayo Clinic, Rochester, MN, USA.
4. Biomedical Statistics, Mayo Clinic, Rochester, MN, USA.
5. Division of Nephrology and Hypertension, Mayo Clinic, Rochester, MN, USA.