1 Section of Surgical Oncology, Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA. william.tseng@med.usc.edu.
2 Division of Surgical Oncology, The James Comprehensive Cancer Center, Ohio State University, Columbus, OH, USA.
3 Department of Surgery, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy.