1. Division of Cardiovascular Medicine, University of Utah School of Medicine, Salt Lake City (J.S.)
2. Cedars-Sinai Heart Institute, Los Angeles, CA (J.K.)
3. Division of Cardiovascular Medicine, Stanford University, CA (S.A.H.)
4. Department of Cardiovascular Surgery, University Heart Center Hamburg, Germany (H.R.)
5. Division of Cardiothoracic Surgery, University of Alabama at Birmingham (J.K.K.).