Hind A. Alnajashi, and Foziah Alshamrani,. “Progressive Multifocal Leukoencephalopathy Risk Mitigation: A Focus on Approved Immunomodulatory Drugs for Multiple Sclerosis Treatment”. Journal of King Abdulaziz University: Medical Sciences, vol. 27, no. 2, Dec. 2020, pp. 33-44, doi:10.4197/Med.27-2.6.