1. Department of Internal Medicine, University of Arizona, Tucson, AZ, USA
2. Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, University of Arizona, Tucson, AZ, USA
3. Department of Internal Medicine, Division of Infectious Diseases, University of Arizona, Southern Arizona VA Health Care System, Tucson, AZ, USA
4. Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, Southern Arizona VA Health Care System, Tucson, AZ, USA