[1] Skane Univ Hosp Lund, Dept Surg, S-22185 Lund, Sweden
[2] Lund Univ, S-22185 Lund, Sweden
[3] Skane Univ Hosp Malmo, Dept Surg, Malmo, Sweden
[4] Norwegian Inst Publ Hlth, Oslo, Norway
[5] Innsbruck Med Univ, Dept Med Stat Informat & Hlth Econ, Innsbruck, Austria
[6] Sahlgrens Univ Hosp, Div Gastroenterol & Hepatol, Dept Internal Med, S-41345 Gothenburg, Sweden
[7] Umea Univ, Dept Surg & Perioperat Sci Urol & Androl, Umea, Sweden
[8] Vrije Univ Amsterdam, Inst Hlth Sci, Amsterdam, Netherlands
[9] Umea Univ, Dept Publ Hlth & Clin Med, Umea, Sweden
[10] Univ Ulm, Inst Epidemiol, Ulm, Germany
[11] Umea Univ, Dept Radiat Sci, Umea, Sweden
[12] Agcy Social & Prevent Med, Bregenz, Austria
[13] Canc Registry Norway, Inst Populat Based Canc Res, Oslo, Norway
[14] Lund Univ, Malmo Diet & Canc Study, Malmo, Sweden
[15] Univ Bergen, Dept Publ Hlth & Primary Hlth Care, Bergen, Norway