1. Department of Surgery, Methodist Richardson Medical Center, Richardson, Texas, USA.
2. Department of Pathology, Methodist Health System, Dallas, Texas, USA.
3. Department of Surgery, Akron General Hospital, Akron, Ohio, USA.
4. Department of Internal Medicine, Jackson Memorial Hospital, Miami, Florida, USA.
5. Texas Radiology Associates, Plano, Texas, USA.
6. Department of Surgery, Morehouse General Hospital, Bastrop, Louisiana, USA.
7. Department of Surgery, The University of Oklahoma at Tulsa, Tulsa, Oklahoma, USA.
8. Department of Surgery, TCU/UNTHSC School of Medicine, Fort Worth, Texas, USA.