COMPARISON THE ANALGESIC EFFECT IN LABOR OF THREE ELECTRIC SYRYNGE SETTINGS FOR PATIENT-CONTROLLED EPIDURAL ANALGESIA (PCEA). YHCĐ [Internet]. 2026 Mar. 2 [cited 2026 Sept. 9];67(2). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/4342