Mastrianni J A, Nixon R, Layzer R, Telling G C, Han D, DeArmond S J, Prusiner S B
Institute for Neurodegenerative Diseases, Department of Neurology, University of California, San Francisco 94143-0518, USA.
N Engl J Med. 1999 May 27;340(21):1630-8. doi: 10.1056/NEJM199905273402104.