[1] Salpetriere Hosp, Natl Reference Ctr Latrogen CJD, F-75651 Paris 13, France
[2] Salpetriere Hosp, INSERM, U360, F-75651 Paris, France
[3] Inst Child Hlth, London, England
[4] NIH, Lab CNS Studies, Bethesda, MD 20892 USA
[5] Erasmus Univ, Sch Med, Rotterdam, Netherlands
[6] Lariboisiere Hosp, Cent Lab Biochem, Paris, France
[7] Western Gen Hosp, CJD Surveillance Unit, Edinburgh EH4 2XU, Midlothian, Scotland