COMPARISON OF ANALGESIC EFFICACY FOR LABOR PAIN MANAGEMENT BETWEEN EPIDURAL BUPIVACAINE 0.0625% AND BUPIVACAINE 0.1% BOTH COMBINED WITH 1 MCG/ML FENTANYL. YHCĐ [Internet]. 2026 Sept. 25 [cited 2026 Oct. 1];67(9). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/6623