The Effects of Fentanyl or Morphine Added to Intrathecal Bupivacaine in Spinal Anesthesia for Cesarean Section . Annals of Medical Research, [S. l.], v. 14, n. 2, p. 0085–0089, 2021. Disponível em: http://www.annalsmedres.org/index.php/aomr/article/view/3162. Acesso em: 9 may. 2025.