Randomized controlled study f entanyl Vs buprenorphine as adjuvants in subarachnoid block with 2-chloroprocaine in anorectal surgery . Asian Journal of Pharmaceutical and Health Sciences, [S. l.], v. 10, n. 3, p. 2348–2354, 2020. Disponível em: https://ajphs.com/index.php/ajphs/article/view/605. Acesso em: 15 mar. 2026.