1. Veterans Affairs Maryland Health Care System, Baltimore, Maryland, USA
2. Department of Epidemiology and Public Health, Division of Genomic Epidemiology & Clinical Outcomes, Baltimore, Maryland, USA
3. Department of Internal Medicine, Division of Infectious Diseases, University of Iowa Roy J. and Lucille A. Carver College of Medicine, Iowa City, Iowa, USA
4. Center for Comprehensive Access & Delivery Research and Evaluation, Iowa City Veterans Affairs Health Care System, Iowa City, Iowa, USA
5. Department of Internal Medicine, Division of General Internal Medicine, University of Iowa Roy J. and Lucille A. Carver College of Medicine, Iowa City, Iowa, USA