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APA Citation
Mentzer, D., Prestel, J., Adams, O., Gold, R., Hartung, H., Hengel, H., Kieseier, B. C., Ludwig, W., & Keller-Stanislawski, B. (2012). case definition for progressive multifocal leukoencephalopathy following treatment with monoclonal antibodies. Journal of neurology, neurosurgery and psychiatry, 83(9), 927–933. http://access.bl.uk/ark:/81055/vdc_100136717342.0x00003d