title: Letter: Progressive multifocal leukoencephalopathy: Complications of immunosuppression.
mesh_terms: D006801:Humans; D007165:Immunosuppression Therapy / Q000009:adverse effects*; D007968:Leukoencephalopathy, Progressive Multifocal / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D027383:Papillomaviridae / Q000472:pathogenicity; D027382:Polyomaviridae