1. Institute for Health & Aging, University of California San Francisco , San Francisco, California , USA
2. Philip Lee Institute for Health Policy Studies, University of California San Francisco , San Francisco, California , USA
3. School of Medicine, University of California San Francisco , San Francisco, California , USA
4. San Francisco Veterans Affairs Health Care System , San Francisco, California , USA
5. University of California Berkeley-University of California San Francisco Joint Medical Program, School of Public Health, University of California , Berkeley, California , USA