Choudhary, Aman, Sakshi Maheshwari, Naveen Paliwal, Shobha Ujwal, and Geeta Singariya. 2020. “Comparative Study of Fentanyl Versus Tramadol As Adjuvant With Low Dose Local Anaesthetic Ropivacaine (0.1%) for Epidural Labour Analgesia”. International Journal of Research in Medical Sciences 8 (9):3309-14. https://doi.org/10.18203/2320-6012.ijrms20203684.