1. Circulation Editorial Offices, Boston, MA
2. Department of Biostatistics, Boston University School of Public Health, Boston, MA
3. Division of Cardiovascular Medicine, Department of Medicine, University of Utah, Salt Lake City, UT
4. Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
5. Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA