[1] Univ Tennessee Hlth Sci Ctr, Dept Surg, Memphis, TN 38163 USA
[2] St Jude Childrens Res Hosp, Dept Surg, Memphis, TN 38105 USA
[3] H Lee Moffitt Canc Ctr & Res Inst, Div Gastrointestinal Oncol, Tampa, FL USA
[4] Augusta Univ, Med Ctr, Div Surg Oncol, Augusta, GA USA