1. Department of Neurosciences; Hospital Santa Maria; Lisboa Portugal
2. Department of Neurology; Academic Medical Centre Amsterdam; Amsterdam The Netherlands
3. Department of Neurology; Hôpital Lariboisière; Paris France
4. Department of Neurology; Instituto Nacional de Neurologia y Neurocirurgia; México City México
5. Department of Neurology; Universidade Federal de São Paulo; São Paulo Brazil