1. Department of Surgery, University of Michigan, Ann Arbor
2. Department of Cardiac Surgery, University of Michigan, Ann Arbor
3. Department of Surgery, Louisiana State University, New Orleans
4. Department of Surgery, University of Alabama at Birmingham, Birmingham
5. Department of Surgery, University of Wisconsin-Madison
6. Department of Surgery, Oregon Health and Science University, Portland
7. Department of Anesthesia, University of California, San Francisco