1. Department of Medicine, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA
2. Division of Infectious Diseases and Geographic Medicine, Stanford University School of Medicine, Stanford, CA, USA
3. Department of Pharmacy, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA
4. Department of Pharmacy Practice, Thomas J. Long School of Pharmacy & Health Sciences, University of the Pacific, Stockton, CA, USA
5. Office of Public Health Surveillance & Research, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA