1 Veterans Affairs San Diego Healthcare System, Veterans Health Administration, United States Department of Veterans Affairs, San Diego, CA, United States.
2 University of California San Diego Health, University of California, San Diego, San Diego, CA, United States.
3 San Francisco Veterans Affairs Health Care System, Veterans Health Administration, United States Department of Veterans Affairs, San Francisco, CA, United States.
4 School of Medicine, University of California, San Francisco, San Francisco, CA, United States.