Institution: | 1. Division of Cardiovascular Surgery, Hospital of the University of Pennsylvania, Philadelphia, Pa;2. Division of Cardiovascular Surgery, St Paul''s Hospital, Vancouver, British Columbia, Canada;3. Department of Cardiac Surgery, Vanderbilt Medical Center, Nashville, Tenn;4. Mission Health and Hospitals, Asheville, NC;5. Department of Cardiac Surgery, Herzzentrum Leipzig GmbH, Leipzig, Germany;6. Division of Cardiovascular Surgery, Mayo Clinic, Rochester, Minn |