Levine, M. A., T. Schuler, and S. Gourishankar. “Complications in the 90-Day Postoperative Period Following Kidney Transplant and the Relationship of the Charlson Comorbidity Index”. Canadian Urological Association Journal, vol. 11, no. 12, Nov. 2017, pp. 388-93, doi:10.5489/cuaj.4378.