[1] Massachusetts Gen Hosp, Boston, MA 02114 USA
[2] Brigham & Womens Hosp, Channing Div Network Med, Boston, MA 02115 USA
[3] Karolinska Inst, Med Epidemiol & Biostat, Stockholm, Sweden
[4] Natl Canc Ctr, Singapore, Singapore
[5] Harvard Sch Publ Hlth, Epidemiol, Boston, MA USA
[6] Yale Univ, Yale Canc Ctr, New Haven, CT 06520 USA
[7] Harvard Univ, Dana Farber Canc Ctr, Cambridge, MA 02138 USA
[8] Massachusetts Gen Hosp, Ctr Liver, Boston, MA 02114 USA
[9] Massachusetts Gen Hosp, Gastrointestinal Div, Boston, MA 02114 USA
[10] Harvard Med Sch, Boston, MA USA