1. Christian-Albrechts University, Department of Neurology, Kiel, Germany.
2. Universidade Federal de São Paulo, Escola Paulista de Medicina, Departamento de Neurologia e Neurocirurgia, São Paulo SP, Brazil.
3. Hospital Israelita Albert Einstein, São Paulo SP, Brazil.
4. University of Utah, Department of Neurology, Salt Lake City, Utah, United States.
5. University of Toronto, Sunnybrook Hospital, Toronto, ON, Canada.
6. University of Toronto, Toronto Western Hospital, Toronto, ON, Canada.