1. Department of Surgery, University of North Carolina at Chapel Hill
2. Department of Biostatistics, University of North Carolina at Chapel Hill
3. Department of Surgery, East Carolina Brody School of Medicine, Greenville, North Carolina
4. Department of Surgery, Carolinas Medical Center, Charlotte, North Carolina
5. Department of Surgery, New Hanover Regional Medical Center, Wilmington, North Carolina
6. Department of Surgery, Wake Forest University School of Medicine, Winston-Salem, North Carolina
7. Department of Psychiatry, University of North Carolina at Chapel Hill