Chung Sang Tse1, Lyle D Joyce2, Joseph F Malouf3, Vien Le4, Roger L Click5. 1. Department of Internal Medicine, Mayo Clinic, Rochester, MN, USA. 2. Division of Cardiovascular Surgery, Mayo Clinic, Rochester, MN, USA. 3. Division of Cardiovascular Diseases, Mayo Clinic, 200 First St SW, Rochester, MN, 55905, USA. 4. Department of Cardiology, Mayo Clinic Health System, Eau Claire, WI, USA. 5. Division of Cardiovascular Diseases, Mayo Clinic, 200 First St SW, Rochester, MN, 55905, USA. click.roger@mayo.edu.