1. Division of Surgical Oncology, Department of Surgery, University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, Colorado, USA
2. Department of Hepatobiliary and Pancreatic Surgery, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan
3. Surgical Outcomes and Applied Research, Department of Surgery, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
4. Division of Cardiothoracic Surgery, Department of Surgery, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
5. Department of Biostatistics and Informatics, Colorado School of Public Health, Aurora, Colorado, USA
6. Department of Radiation Oncology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
7. Clinical Trials Office, Department of Surgery, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
8. First Surgical Clinic, Department of Surgical, Gastroenterological and Oncological Science, University of Padua, Padua, Italy
9. University of Colorado Cancer Center, Denver, Colorado, USA