[1] Helen F Graham Canc Ctr, Dept Surg, Newark, DE 19713 USA
[2] Univ Pittsburgh, Div Surg Oncol, Pittsburgh, PA USA
[3] Vanderbilt Ingram Canc Ctr, Div Internal Med & Med Oncol, Nashville, TN USA
[4] Massachusetts Gen Hosp, Dept Pathol, Boston, MA 02114 USA
[5] Harvard Univ, Sch Med, Boston, MA USA
[6] Johns Hopkins, Sidney Kimmel Comprehens Canc Ctr, Gastrointestinal Oncol Program, Baltimore, MD USA
[7] Helen F Graham Canc Ctr, Dept Surg, Newark, DE 19713 USA
[8] Univ Calif San Francisco, Dept Clin Med, San Francisco, CA 94143 USA