1. Department of Neurology Brigham and Women's Hospital, Harvard Medical School Boston MA
2. Department of Neurology Massachusetts General Hospital, Harvard Medical School Boston MA
3. Department of Neurology, Centro Hospital Universitário São João Faculty of Medicine, University of Porto Porto Portugal
4. Department of Neurosurgery The University of Texas Health Science Center at Houston, McGovern Medical School Houston TX
5. Department of Neurology Northwestern Memorial Hospital, Feinberg School of Medicine Chicago IL