1. Department of Surgery, University at Buffalo, Jacobs School of Medicine and Biomedical Sciences, Buffalo, NY, USA
2. Washington and Lee University, Lexington, VA, USA
3. University of Southern Mississippi, Hattiesburg, MS, USA
4. Dartmouth Hitchcock Medical Center, Lebanon, NH, USA
5. White River Junction Veterans Affairs Medical Center, White River Junction, VT, USA
6. Department of Surgery, Contra Costa Health Services, Martinez, CA, USA
7. Department of Surgery, Gila Regional Medical Center, Silver City, NM, USA