1 Division of Cardiovascular Medicine, Henry Ford Hospitals, 2799 W Grand Blvd, K14 Cardiology Detroit, MI 48202. Electronic address: jcowger1@hfhs.org.
2 MedStar Department of Cardiac Surgery, MedStar Heart and Vascular Institute, Georgetown University, Washington, DC.
3 Department of Cardiac Surgery, University of Michigan, Ann Arbor, Michigan.