Division of Surgery and Oncology, Department of Clinical Science, Intervention and Technology, Karolinska Institutet, and Center for Upper Gastrointestinal Diseases, C1.77, Karolinska University Hospital, 141 86 Stockholm, Sweden; Surgical Oncology Unit, Surgical Department ASST Bergamo Ovest, Piazzale Ospedale 1, 24047 Treviglio, BG, Italy.