1. Department of Neurology Washington University in St. Louis St. Louis Missouri USA
2. Department of Population Health Sciences Weill Cornell Medical College Cornell University New York New York USA
3. Medical University of Havana Havana Cuba
4. Department of Medicine Medical Sciences Campus University of Puerto Rico San Juan Puerto Rico USA
5. Universidad Nacional Pedro Henriquez Ureña (UNPHU) Santo Domingo Dominican Republic
6. Medicine Department Caracas University Hospital Faculty of Medicine Universidad Central de Venezuela Caracas Venezuela
7. National Institute of Neurology and Neurosurgery La Habana Cuba
8. Department of Medicine Stanford University Stanford California USA
9. Department of Demography University of California at Berkeley Berkeley California USA
10. School of Public Health University of California at Berkeley Berkeley California USA