1. From the Department of Surgery, Howard University College of Medicine, Washington, DC (Zeineddin, Cornwell III, Fullum, Chu, Ayad, Li, Williams)
2. Clive O Callender Surgery Outcomes Center, Howard University, Washington, DC (Zeineddin, Cornwell III, Fullum, Chu, Williams)
3. Department of Surgery, Mayo Clinic, Rochester, MN (Kearse).