[1] N Tyneside Gen Hosp, Dept Surg, N Shields NE29 8NH, Tyne & Wear, England
[2] Univ Genoa, Genoa, Italy
[3] Dr Horst Schmidt Kliniken Wiesbaden, Wiesbaden, Germany
[4] CHU Nantes, Hotel Dieu, F-44035 Nantes 01, France
[5] AstraZeneca R&D, Molndal, Sweden
[6] Haukeland Hosp, N-5021 Bergen, Norway
[7] Karolinska Univ, Huddinge Hosp, Stockholm, Sweden