TY - JOUR AU - Torzilli, G TI - Contrast-enhanced intraoperative ultrasonography during hepatectomies for colorectal cancer liver metastases JO - J Gastrointest Surg IS - 08 VL - 9 PY - 2005 DO - 10.1016/j.gassur.2005.08.016 SP - 1148 EP - 1153 N1 - ; discussion 1153-1154 ER -