Abdominal Drainage After Major Hepatic Resection: a Randomized Clinical Trial

INTERVENTION: Group A:Abdominal Drainage;Group B:No Abdominal Drainage; CONDITION: patients who need to resect more than three Couinaud's segments of liver PRIMARY OUTCOME: Wound complications;subhepatic collection;Additional procedures for subhepatic collection; SECONDARY OUTCOME: hospital stay;respiratory complications;liver failure;Urinary tract complications;mortality;Cardiac complication; INCLUSION CRITERIA: 1. Male and female aged 18 to 65 years old; 2. Child‐Pugh grade A3.no severe diseases of other organs.