Aditya Prakash; Hirday Kumar; Pankaj Kumar. Intraperitoneal Bupivacaine Alone or With Dexmedetomidine or Tramadol or Fentanyl for Post Operative Analgesia Following Laparoscopic Cholecystectomy: A Comparative Evaluation. Int. J. Heal. Clin. Res. 2021, 4, 43-47.