[1] Karolinska Inst, Karolinska Univ Hosp, Upper Gastrointestinal Surg, Dept Mol Med & Surg, Stockholm, Sweden
[2] Soder Sjukhuset, Dept Upper Gastrointestinal Surg, SE-18883 Stockholm, Sweden
[3] Karolinska Inst, Karolinska Univ Hosp, Vasc Surg, Dept Mol Med & Surg, Stockholm, Sweden
[4] Univ Calif Irvine, Coll Hlth Sci, Program Publ Hlth, Irvine, CA USA
[5] Kings Coll London, Div Canc Studies, London, England
[6] Guys & St Thomas NHS Fdn Trust, London, England