Affiliation: | 1. Minneapolis VA Medical Center and University of Minnesota, Minneapolis, Minnesota;2. VA North Texas Health Care System and University of Texas Southwestern Medical Center, Dallas, Texas;3. Columbia University, New York, New York;4. Henry Ford Health System, Edith and Benson Ford Heart and Vascular Institute, Detroit, Michigan;5. Massachusetts General Hospital, Boston, Massachusetts;6. UC San Diego Medical Center, San Diego, California |