1. From the Section of Upper Gastrointestinal Surgery, Department of Surgery, Hospital del Mar Medical Research Institute Universitat Autònoma de Barcelona (Montcusí, Jaume-Bottcher, Álvarez, Ramón, Grande, Pera), Barcelona, Spain.
2. the Department of Radiology, Hospital del Mar, Universitat Pompeu Fabra (Sánchez-Parrilla), Barcelona, Spain.