[1] Uppsala Univ, Dept Surg Sci Vasc Surg, Uppsala, Sweden
[2] Umea Univ, Dept Surg & Perioperat Sci, Umea, Sweden
[3] Gavle Cty Hosp, Dept Surg, Gavle, Sweden
[4] Uppsala Univ, Reg Gavleborg, Ctr Res & Dev, Gavle, Sweden
[5] Uppsala Univ, Reg Dalarna, Ctr Clin Res, Falun, Sweden
[6] Falun Cty Hosp, Dept Surg, Falun, Sweden