1. Division of Infectious Diseases, University of Louisville, Louisville, KY, USA;
2. Department of Epidemiology and Population Health, School of Public Health and Information Sciences, University of Louisville, Louisville, KY, USA;
3. Division of Pulmonary and Critical Care Medicine, University of Connecticut School of Medicine, Farmington, CT, USA;
4. Division of Pulmonology, Faculty of Health Sciences, University of the Witwatersrand Medical School, Johannesburg, South Africa;
5. Division of Pulmonary and Critical Care Medicine, University of Louisville, Louisville, KY, USA;
6. Department of Pathology and Laboratory Medicine, University of Louisville, Louisville, KY, USA;
7. Section of Infectious Diseases, Providence Hospital, Washington, D.C, USA