1. Genetic-Epidemiologic Unit, Department of Clinical Genetics, Department of Epidemiology and Biostatistics, Erasmus Medical Center Rotterdam, Post Office Box 1738, 3000 DR Rotterdam, Netherlands.
2. Department of Neurological Sciences, “La Sapienza” University, Viale dell'Università30, 00185 Rome, Italy.
3. Centre for Molecular and Biomolecular Informatics, University Medical Center Nijmegen, Geert Grooteplein Zuid 30, 6525 GA Nijmegen, Netherlands.
4. Neurogenetics Unit, IRCCS INM Neuromed, Località Camerelle, 86077 Pozzilli, Italy.
5. INSERM U 289, Hôpital de la Salpêtrière, 47 Boulevard de l'Hôpital, 75013 Paris, France.
6. Laboratory of Epidemiology and Biostatistics, National Institute for Health, 00161 Roma, Italy.
7. Department of Neurology, Erasmus Medical Center Rotterdam, Dr. Molewaterplein 40, 3015 GD Rotterdam, Netherlands.