Department of Anorectal Surgery;
Affiliated Hospital of Shandong University of Traditional Chinese Medicine;
Department of Hepatobiliary Surgery;
Qilu Hospital of Shandong University;
Department of Anesthesiology;
Qilu Hospital of Shandong University;
Local; wound; infiltration; Ropivacaine; Open; hepatectomy; Postoperative; pain; Surgical; stress;