1. Department of Surgery, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
2. 2nd Department of General and Gastrointestinal Surgery, and Surgical Oncology of the Alimentary Tract, Medical University of Lublin, Lublin, Poland.
3. Department of Surgery, Escola Paulista de Medicina, Federal University of São Paulo, Brazil.
4. Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.