1. Division of Cardiac Surgery, St. Michael’s Hospital, University of Toronto, ON, Canada (S.V.).
2. Division of Cardiovascular Medicine, Brigham and Women’s Hospital Heart & Vascular Center, Harvard Medical School, Boston, MA (D.L.B.)
3. Division of Cardiothoracic Surgery, University of California San Francisco and San Francisco VA Medical Center, San Francisco, CA (E.E.T.).