1. Veterans Affairs Palo Alto Healthcare System, CA (C.M.Y., S.G.).
2. Department of Medicine, Stanford University School of Medicine, and Stanford Cardiovascular Institute, CA (C.M.Y., R.A.H.).
3. Department of Pediatrics, Internal Medicine, and Radiology, University of Michigan, Ann Arbor (S.B., P.A., C.S.D.).
4. Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC (P.S.D.).
5. UC San Diego Health, La Jolla, CA (U.B-G.).
6. Inova Heart and Vascular Institute, Falls Church, VA (W.B.).
7. Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York (R.M.).