SALAMA, A. A.; IBRAHIM, T.; KARAM, S. A comparative study between tramadol and fentanyl in spinal anesthesia in cesarean section. Tishreen University Journal -Medical Sciences Series, [S. l.], v. 39, n. 3, 2018. Disponível em: https://journal.tishreen.edu.sy/index.php/hlthscnc/article/view/3876. Acesso em: 20 may. 2024.