Sumit Das, Pritam Yadav, Sanjay Johar, Naveen Malhotra, Irin Saha and Ritu Rathee 2023. A study to evaluate the efficacy of instillation of ropivacaine with fentanyl, dexmedetomidine, or morphine through surgical drain for post-operative analgesia in patients undergoing modified radical mastectomy. Asian Journal of Medical Sciences. 14, 7 (Jul. 2023), 69–75. DOI:https://doi.org/10.3126/ajms.v14i7.49686.