Gandhi, P.; Agrawal, M.; Agrawal, B.; Behl, S. A Comparative Evaluation of Efficacy of Epidural Dexmedetomidine and Fentanyl As Adjunct to 0.2% Ropivacaine for Post-Operative Analgesia in Elective Abdominal Surgeries. Int J Clin Trials 2021, 8, 1-5.