1. Department of Surgical Oncology, Gustave Roussy, Villejuif Cedex, France;
2. Department of Surgical Oncology, Centre Hospitalier Lyon Sud, Lyon 1 University, Lyon, France;
3. Department of Surgical Sciences-Oncology, Wake Forest Baptist – 1 Medical Center Blvd, Winston-Salem, NC, USA;
4. Department of Surgical Oncology, University of Pittsburgh Medical Center, Pittsburgh, PA, USA;
5. Department of Surgical Oncology, Cancer Institute at Washington Hospital Center, Washington, D.C, USA