Biliary tract surgery: cost versus quality of care in three hospitals.
D000368:Aged; D001660:Biliary Tract Diseases / Q000601:surgery*; D002763:Cholecystectomy / Q000191:economics; D003363:Cost Control; D003695:Delivery of Health Care / Q000191:economics; D003953:Diagnosis-Related Groups; D006801:Humans; D009518:New York; D011183:Postoperative Complications / Q000628:therapy; D011785:Quality Assurance, Health Care / Q000191:economics*