[1] Univ Hosp, Clin Cardiovasc Surg, Zurich, Switzerland
[2] Stockholm South Hosp, Dept Surg, SE-11883 Stockholm, Sweden
[3] NYU, Div Vasc Surg, Dept Surg, New York, NY USA
[4] Cleveland Clin, Div Vasc Surg, Cleveland, OH 44106 USA
[5] Uppsala Univ, Dept Surg Sci Vasc Surg, Uppsala, Sweden