1. Division of Cardiology, Department of Medicine, University of Iowa, Iowa City, Iowa, USA.
2. Department of Internal Medicine, University of Kentucky, Lexington, Kentucky, USA.
3. Department of Medicine, University of Iowa, Iowa City, Iowa, USA.
4. Department of Cardiology, Case Western Reserve University/MetroHealth Medical Center, Cleveland, Ohio, USA.
5. Division of Cardiology, Creighton University, Omaha, Nebraska, USA.
6. Department of Internal Medicine, The University of Toledo, Toledo, Ohio, USA
7. Department of Gastroenterology, Indiana University, Indianapolis, Indiana, USA.