1. Division of Cardiology, San Francisco General Hospital, CA (D.D.W.).
2. Department of Medicine, University of California, San Francisco (D.D.W.).
3. The Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York (G.W.S.).
4. Cardiovascular Research Foundation, New York (G.W.S.).