1. Department of Medicine, Division of Infectious Diseases, University of Colorado at Denver and Health Sciences Center, 4200 East Ninth Avenue, Denver, CO 80262, USA
2. Department of Medicine, Denver Health and Hospital Authority, 605 Bannock Street, Denver, CO 80204, USA
3. Denver Public Health Department, Denver Health and Hospital Authority, 605 Bannock Street, Denver, CO 80204, USA