Benefits of simultaneous laparoscopic colorectal surgery and liver resection for colorectal cancer with synchronous liver metastases: retrospective case-matched study

Interventions: patient who had laparoscopic surgery for colorectal cancer with liver metastases,patient who had open surgery for colorectal cancer with liver metastases;Treatment,Treatment;laparoscopic group,open group
Primary outcome(s): perioperative outcomes retrospective case-matched study