1. Department of Physical Medicine and Rehabilitation, University of Pittsburgh , Pittsburgh, Pennsylvania , USA
2. Department of Epidemiology, School of Public Health, University of Pittsburgh , Pittsburgh, Pennsylvania , USA
3. Research Institute, California Pacific Medical Center , San Francisco, California , USA
4. Department of Epidemiology and Biostatistics, University of California , San Francisco, California , USA
5. AdventHealth , Orlando, Florida , USA
6. Department of Psychiatry, Neurology, and Epidemiology and Biostatistics, University of California , San Francisco, California , USA
7. VA Medical Center, San Francisco , San Francisco, California , USA