1. Department of Medicine and Oncology, Southern Älvsborg Hospital, Borås, Sweden;
2. Regional Cancer Center Southeast Sweden, and Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden;
3. Department of Surgery, University Hospital, Linköping, Sweden;
4. Department of Oncology, Institute of Clinical Sciences at Sahlgrenska Academy, University of Gothenburg Sahlgrenska University Hospital, Gothenburg, Sweden;
5. Regional Cancer Center, Sahlgrenska University Hospital, Gothenburg, Sweden