Yadav, T., Golhar, M., Johar, S., Malhotra, N., & Gupta, R. (2021). 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, 12(6), 23–28. https://doi.org/10.3126/ajms.v12i6.34795