[1
]Visceral Surgery DepartmentGeneva University Hospital Genève Switzerland
[2
]Department of Visceral and Vascular SurgeryUniversity of Cologne Cologne Germany
[3
]Department of Surgical Gastroenterology and Center of Excellence for Upper Gastro
Intestinal SurgeryMadras Medical College and Rajiv Gandhi Government General Hospital
Chennai India
[4
]Department of General, Visceral and Transplantation SurgeryUniversity Hospital Heidelberg
Heidelberg Germany
[5
]Department of SurgeryParacelsus Medical University Salzburg Austria
[6
]Department of General SurgeryUniversity of Verona Verona Italy
[7
]Department of SurgeryRoyal Marsden Hospital London UK