2Zacherl J, Scheuba C, Imhof M, et al. Current value of in- traoperative sonography during surgery for hepatic neo- plasms[J]. World J Surg,2002, 26(5) : 550-554.
3Berber E, Garland A M, Engle K L, et al. Laparoscopic ultrasonography and biopsy of hepatic tumors in 310 pa- tients[J]. Am J Surg,2004, 187(2): 213-218.