1. Department of Neuroscience, Institute of Psychiatry, Denmark Hill, London, U.K.
2. Laboratoire d'Anatomie Pathologique et de Microscopie Electronique, Universite Libre de Bruxelles, Route de Lennik, B-1070, Bruxelles, Belgium
3. Neurolog Institute of Psychiatry, Denmark Hill, London, U.K.
4. Neuropathology, Institute of Psychiatry, De Crespigny Park, Denmark Hill, London, SE5 8AF, U.K.