1. Department of Community Health Systems, University of California, San Francisco, School of Nursing, San Francisco Veterans Affairs Medical Center, USA
2. University of California, San Francisco, School of Nursing, USA
3. Department of Medicine and Epidemiology & Biostatistics, University of California, San Francisco, San Francisco Veterans Affairs Medical Center, USA
4. Department of Epidemiology & Biostatistics, University of California, San Francisco, USA
5. University of Virginia, School of Nursing, USA