1. Department of Emergency Medicine, University of Cincinnati, Cincinnati, Ohio, USA.
2. Biostatistics Research Center, Herbert Wertheim School of Public Health and Human Longevity Science, University of California, San Diego, La Jolla, California, USA.
3. Department of Neurological Surgery, University of California, San Francisco, California, USA.
4. Departments of Psychiatry and Family Medicine & Public Health, University of California, San Diego, San Diego, California, USA.
5. Departments of Neurosurgery & Neurology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
6. Department of Physical Medicine and Rehabilitation, Department of Physical Medicine and Rehabilitation, Baylor College of Medicine, Houston, Texas, USA.
7. Department of Physical Medicine and Rehabilitation, Harvard Medical School and Spaulding Rehabilitation Hospital, Charlestown, Massachusetts, USA.