Schwenk H, Ramirez-Avila L, Sheu SH, Wuthrich C, Waugh J, Was A, Degirolami U, Burchett S, Koralnik IJ, Ahmed A. Progressive multifocal leukoencephalopathy in pediatric patients: case report and literature review. Pediatr Infect Dis J. 2014 Apr; 33(4):e99-105.