[1] Erasmus MC, Dept Gen Surg, NL-3000 CA Rotterdam, Netherlands
[2] Linkoping Univ, Dept Surg, S-58183 Linkoping, Sweden
[3] Vrije Univ Amsterdam, Med Ctr, Dept Surg, Amsterdam, Netherlands
[4] Ninewells Hosp & Med Sch, Univ Dept Surg, Dundee, Scotland
[5] Ctr Hosp Intercommunal, Dept Surg, Poissy, France
[6] Washington Univ, Div Gen Surg, St Louis, MO USA
[7] St James Univ Hosp, Acad Surg Unit, Leeds LS9 7TF, W Yorkshire, England
[8] Sahlgrens Univ Hosp, Dept Surg, S-41345 Gothenburg, Sweden
[9] St Blasius Gen Hosp, Dept Thorac Abdominal & Minimally Invas Surg, Dendermonde, Belgium
[10] Humboldt Univ, Dept Surg, Berlin, Germany
[11] Catharina Hosp, Dept Surg, Eindhoven, Netherlands
[12] Hannover Hosp, Dept Surg, Hannover, Germany
[13] Hannover Hosp, Ctr Minimally Invas Surg, Hannover, Germany
[14] Hosp Clin I Provincial, Dept Surg, Barcelona, Spain
[15] Univ Rome, Dept Surg, Rome, Italy
[16] Univ Hull, Castle Hill Hosp, Acad Surg Unit, Cottingham, England
[17] Univ Turin, Dept Surg, Turin, Italy
[18] Univ Cologne, Biochem & Expt Div, Dept Surg 2, Cologne, Germany
[19] Cleveland Clin Florida, Dept Colorectal Surg, Weston, FL USA
[20] Columbia Univ Coll Phys & Surg, Sect Colon & Rectal Surg, New York, NY 10032 USA