9Boutros M, Hippalgaonkar N, Silva E, et al. Laparoseopic resection of rectal cancer results in higher lymph node yield and better short - term outcomes than open surgery [J] . Dis Colon Rectum, 2013, 56 (6) : 679 - 688.
10Kong KH, Kim ID, Kim KH, et al. Single - center comparative study of laparoscopic versus open colon surgery [ J] . J Minim Invasive Surg, 2012, 15 (4): 133-137.