A study to evaluate the efficacy of instillation of ropivacaine with tramadol through surgical drains for post-operative analgesia in patients undergoing mastectomy. Asian Journal of Medical Sciences, [S. l.], v. 12, n. 6, p. 23–28, 2021. DOI: 10.3126/ajms.v12i6.34795. Disponível em: https://nepjol.info/index.php/AJMS/article/view/34795. Acesso em: 12 jul. 2026.