THE EFFECTIVENESS OF PAIN RELIEF AND SIDE EFFECTS OVER TIME OF THE CONTINUOUS EPIDURAL ANESTHESIA IN LABOR AT HAI PHONG OBSTETRICS HOSPITAL. YHCĐ [Internet]. 2026 July 6 [cited 2026 Sept. 9];67(CĐ7-Trường ĐH Y Dược Hải Phòng). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/5591