[1] Mayo Clin, Dept Oncol, 200 First St Southwest, Rochester, MN 55905 USA
[2] European Inst Oncol, Div Epidemiol & Biostat, Milan, Italy
[3] Mayo Clin, Div Biostat, Rochester, MN USA
[4] Mayo Clin, Dept Hlth Sci Res, Rochester, MN USA
[5] UT MD Anderson Canc Ctr, Dept Gastrointestinal Med Oncol, Houston, TX USA
[6] Yale Univ, Sch Publ Hlth, Dept Chron Dis Epidemiol, New Haven, CT USA
[7] Univ Hawaii, Ctr Canc, Canc Epidemiol Program, Honolulu, HI 96822 USA
[8] Louisiana State Univ, Sch Publ Hlth, New Orleans, LA USA
[9] Tulane Sch Publ Hlth, New Orleans, LA USA
[10] Univ Milan, Dept Epidemiol, IRCCS Ist Ric Farmacol Mario Negri, Milan, Italy
[11] Univ Milan, Dept Clin Sci & Community Hlth, Milan, Italy
[12] IRCCS, Ctr Riferimento Oncol, SOC Epidemiol & Biostat, Aviano, PN, Italy
[13] Natl Inst Publ Hlth & Environm RIVM, Bilthoven, Netherlands
[14] Univ Med Ctr, Dept Gastroenterol & Hepatol, Utrecht, Netherlands
[15] Univ London Imperial Coll Sci Technol & Med, Sch Publ Hlth, London, England
[16] Univ Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA 94143 USA
[17] Univ Toronto, Div Gen Surg, Toronto, ON, Canada
[18] QIMR Berghofer Med Res Inst, Canc & Populat Studies Grp, Brisbane, Qld, Australia
[19] New York Med Coll, Dept Surg, Dept Family Med, Valhalla, NY 10595 USA