Thomas H Schindler1,2, Gabriel Felder3. 1. Division of Nuclear Medicine, Washington University School of Medicine, Mallinckrodt Institute of Radiology, 510 S. Kingshighway, St. Louis, MO, 63110, USA. thschindler@wustl.edu. 2. Cardiovascular Division, John T. Milliken Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, USA. thschindler@wustl.edu. 3. Division of Nuclear Medicine, Washington University School of Medicine, Mallinckrodt Institute of Radiology, 510 S. Kingshighway, St. Louis, MO, 63110, USA.