Comparison Among Intrathecal Fentanyl And Butorphanol As An Adjuvant To Hyperbaric Bupivacaine For Lower Limb Orthopaedic Procedures . Indian Journal of Applied-Basic Medical Sciences, [S. l.], v. 23, n. 36, 2021. DOI: 10.48165/ijabms.2021.23125 . Disponível em: https://acspublisher.com/journals/index.php/ijabms/article/view/1446.. Acesso em: 23 jul. 2024.