[1] Univ Colorado, Sch Med, Dept Surg, Div Surg Oncol, Aurora, CO 80045 USA
[2] Mem Sloan Kettering Canc Ctr, Dept Surg, Div Pediat Surg, New York, NY USA
[3] Umea Univ, Dept Surg & Perioperat Sci, Surg, Umea, Sweden
[4] Tokyo Med & Dent Univ, Grad Sch Med, Dept Hepatobiliary & Pancreat Surg, Tokyo, Japan
[5] Univ Colorado, Dept Radiol, Div Abdominal Imaging, Sch Med, Aurora, CO USA