Mathew, Litha Mary, Leejia Mathew, Verghese Cherian, and Alice David. 2022. “Effect of Epidural Ketamine on Pain After Total Knee Arthroplasty: A Randomized Double- Blind Placebo Controlled Clinical Trial”. Christian Journal for Global Health 9 (1), 77-86. https://doi.org/10.15566/cjgh.v9i1.641.