Comparison of 0.25% Bupivacaine with Tramadol Versus 0.125% Bupivacaine with Tramadol in Epidural B Analgesia for Labor Pain. Medical Forum Monthly, [S. l.], v. 33, n. 5, 2022. Disponível em: https://medicalforummonthly.com/index.php/mfm/article/view/713.. Acesso em: 1 jun. 2026.