1. Division of Neurology; Department of Medicine and Therapeutics; Prince of Wales Hospital; The Chinese University of Hong Kong; Hong Kong China
2. Departments of Medicine and Neurology; The University of Melbourne; Royal Melbourne Hospital; Melbourne Victoria Australia
3. Department of Neurology; Christian-Doppler-Klinik; Paracelsus Medical University; Salzburg Austria
4. Department of Neurology; University Hospital Gasthuisberg; Leuven Belgium
5. First Department of Neurology; St. Anne's University Hospital; School of Medicine; and Central European Centre for Technology (CEITEC); Masaryk University; Brno Czech Republic
6. UCB Pharma; Biostatistics US Group; Raleigh North Carolina U.S.A
7. UCB Pharma; CNS; Raleigh North Carolina U.S.A