[1] Portsmouth Hosp Univ NHS Trust, Queen Alexandra Hosp, Dept Colorectal Surg, Portsmouth, England
[2] AZ Sint Lucas, Dept Gen & Abdominal Surg, Ghent, Belgium
[3] Portsmouth Hosp Univ NHS Trust, Queen Alexandra Hosp, Radiol Dept, Portsmouth, England
[4] Portsmouth Hosp Univ NHS Trust, Queen Alexandra Hosp, Care Grp Director Surg, Portsmouth, England
[5] Portsmouth Hosp Univ NHS Trust, Queen Alexandra Hosp, Dept Upper GI Surg, Portsmouth, England
[6] Univ Portsmouth, Fac Sci, Sch Hlth Sci & Social Work, Portsmouth, England
[7] Portsmouth Hosp Univ, Queen Alexandra Hosp, Dept Colorectal Surg, Southwick Hill Rd, Portsmouth PO6 3LY, England