1. Department of Surgery, School of Medicine, The Johns Hopkins University, Baltimore, Maryland
2. Department of Surgery, School of Medicine, Emory University, Atlanta, Georgia
3. Department of Surgery, University of Virginia Healthcare System, Charlottesville
4. Department of Surgery, Curry Cabral Hospital, Lisbon, Portugal
5. Department of Surgery, Central Lisbon Hospital Centre, Lisbon, Portugal
6. Department of Surgery, School of Medicine, Stanford University, Palo Alto, California
7. Department of Surgery, Ospedale San Raffaele, Milan, Italy
8. Department of Surgery, Université Catholique de Louvain, Brussels, Belgium
9. Department of Surgery, Medical College of Wisconsin, Milwaukee