[1] Aristotle Univ Thessaloniki, Sch Med, Thessalonike, Greece
[2] Victoria Hosp, Dept Gen Surg, NHS Fife, Kirkcaldy, Scotland
[3] Univ Coll London Hosp NHS Fdn Trust, Dept Thorac Surg, London, England
[4] Victoria Hosp, Dept Gen Surg, Kirkcaldy KY2 5AH, Scotland