1. Department of Internal Medicine, Kansas University School of Medicine-Wichita, Wichita, KS 67214, USA
2. Division of Cardiovascular Surgery, University of Tsukuba, Tsukuba 305-8577, Ibaraki, Japan
3. Division of Cardiothoracic Surgery, Department of Surgery, Westchester Medical Center, Valhalla, NY 10595, USA
4. Division of Cardiology, Department of Medicine, Johns Hopkins University Baltimore, Baltimore, MD 21218, USA
5. Department of Cardiovascular Medicine, Cleveland Clinic, Cleveland, OH 44195, USA
6. Division of Cardiology, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY 10461, USA
7. Division of Cardiovascular Medicine, Section of Heart Failure and Transplantation, University of Iowa, Iowa City, IA 52242, USA