The member of National Evidence-based Healthcare Collaborating Agency and the planning committee of Korean Association of hepato-biliary pancreatic Surgery established the protocol of Korean Surgical Quality Improvement Program (KSQIP) with verifying variables of American College of Surgeons - National Surgical Quality Improvement Program (ACS-NSQIP and National Clinical Database (NCD) of Japan; demographics, preoperative information, laboratory values, operation finding, general occurrences, postoperative occurrences, and follow-up data to develop post cholecystectomy complication risk model.

The 50 surgeons from 20 hospitals have decided to participated in the primary prospective study to apply KSQIP to cholecystectomy. The investigators developed web-based database system (http://www.ksqip.org/gb) and surgical clinical reviewer of each hospital will fill out the case report form. Finally, the investigators will provide a risk-adjusted surgical risk calculator and feedback system for reducing complication.

Inclusion Criteria:

• Patient who underwent cholecystectomy with cholecystitis or gallbladder polyp or cholelithiasis

Exclusion Criteria:

• Under 18 age
• Who underwent other abdominal surgery simultaneously
• Gallbladder Cancer, cholangiocarcinoma
• Who did not agree with participation

patient who underwent cholecystectomy with cholecystitis or gallbladder polyp or cholelithiasis