1 Department of Surgery, Division of Surgical Oncology, University of Texas at Southwestern Medical Center, Dallas, TX, USA.
2 Department of Surgery, University of Michigan, Ann Arbor, MI, USA.
3 Department of Surgery, Yale School of Medicine, New Haven, CT, USA.
4 VA Healthcare System, Ann Arbor, MI, USA.
5 Department of Surgery, Division of Surgical Oncology, University of Texas at Southwestern Medical Center, Dallas, TX, USA. patricio.polanco@utsouthwestern.edu.