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. - Das, Sumit; Yadav, Pritam; Johar, Sanjay; Malhotra, Naveen; Saha, Irin; Rathee, Ritu (Asian Journal of Medical Sciences, 2023)