1 Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden; Department of Surgery, Linköping University Hospital, Linköping, Sweden.
2 Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden; Department of Surgery, Faculty of Medicine, Suez Canal University, Ismailia, Egypt.
3 Department of Surgery, Ryhov County Hospital, Jönköping, Sweden.