Mishra, A. K. ., S. . Kumar, N. . Agasti, G. . Guha, S. . Ghosh, B. . Mohanty, P. S. Ngullie, and J. Mukherjee. “Hepatitis B Virus-Induced CD4 Lymphocytopenia: A Rare Cause of Progressive Multifocal Leukoencephalopathy”. Asian Journal of Medical Sciences, vol. 13, no. 10, Oct. 2022, pp. 288-92, doi:10.3126/ajms.v13i10.44407.