1. National Public Health Institute, Department of Human Molecular Genetics, Mannerheimintie 166, 00300 Helsinki, Finland.
2. VTT Biotechnology, Espoo, Finland.
3. Division of Biochemistry and Genetics, Department of Neurological Research, National Neurological Institute “C. Besta,” Milan, Italy.
4. Centro Dino Ferrari, Istituto di Clinica Neurologica, Università degli Studi di Milano, Istituto di Ricovero e Cura a Carattere Scientifico Ospedale Maggiore Policlinico, Milan, Italy.
5. Department of Human Genetics, University of California School of Medicine, Los Angeles, CA 10095–7088, USA.