1. Colon and Rectal Surgery, Ospedale “per gli Infermi”, AUSL Romagna, Faenza, Italy
2. Division of Colon and Rectal Surgery, Department of Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
3. Geriatrics Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY
4. Department of Surgery, Center for Healthcare Outcomes and Policy, University of Michigan, Ann Arbor, MI
5. Department of Surgery, St Michael's Hospital, Toronto, Ontario, Canada
6. Division of General Surgery, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
7. Li Ka Shing Knowledge Institute, St Michael's Hospital, Toronto, Ontario, Canada