1. Department of Surgical Sciences, Uppsala University, Uppsala, Sweden
2. Department of Clinical Science, Intervention and Technology, Centre for Upper Gastrointestinal Cancer, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
3. Department of Surgery, Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
4. Department of Surgery, Lund University, Lund, Sweden