1. Keck School of Medicine, Department of Neurology, University of Southern California, Los Angeles
2. Department of Neurology, Baylor College of Medicine, Houston, Texas
3. National Institute of Neurology and Neurosurgery, Mexico City, Mexico
4. Keck School of Medicine, Department of Preventive Medicine, Institute for Health Promotion and Disease Prevention, Norris Comprehensive Cancer Center, University of Southern California, Los Angeles
5. Department of Research and Evaluation, Kaiser Permanente Southern California, Pasadena