1. Department of Neurology, Massachusetts General Hospital, Boston, MA, USA;
2. Department of Neurology, Yale School of Medicine, New Haven, CT, USA;
3. Department of Teaching and Learning Center, Yale School of Medicine, New Haven, CT, USA;
4. Department of Neurobiology, Yale School of Medicine, New Haven, CT, USA;
5. Office of Education, Yale School of Medicine, New Haven, CT, USA;
6. Department of Medicine, Division of Neurology, Dalhousie University, Halifax, Canada