https://doi.org/10.1016/j.bjane.2021.10.010
Braz J Anesthesiol, vol.73, 2021 Safety and effectiveness of adding fentanyl or sufentanil to spinal anesthesia: systematic review and meta-analysis of randomized controlled trials Systematic Review
Braz J Anesthesiol, vol.73, 2021 Safety and effectiveness of adding fentanyl or sufentanil to spinal anesthesia: systematic review and meta-analysis of randomized controlled trials Systematic Review