1. Department of Molecular Medicine and Surgery, Surgical Care Science, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden;
2. Department of Molecular Medicine and Surgery, Upper Gastrointestinal Surgery, Karolinska Institutet, Stockholm, Sweden;
3. Division of Cancer Studies, King’s College London, London, UK;
4. Guy’s and St Thomas’ NHS Foundation Trust, London, UK;
5. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden;
6. Department of Women’s and Children’s Health, Clinical Psychology in Healthcare, Uppsala University, Uppsala, Sweden