D. Muhammad Jamali, T. Ali, B. Liaqat Chaudhry, S. R. Hassan, N. Akhtar, and M. M. Saifullah Awan, “Efficacy of Spinal Epidural Anesthesia and Sub Diaphragmatic Lidocaine with Spinal Anesthesia in reduction of shoulder pain: Randomized Clinical trial: Efficacy of Spinal Epidural Anesthesia and Sub Diaphragmatic Lidocaine”, PBMJ, vol. 5, no. 5, pp. 282–287, May 2022, doi: 10.54393/pbmj.v5i5.468.