1. J. Willis Hurst Internal Medicine Residency Program, Department of Medicine, Emory University School of Medicine, Atlanta, GA 30303, USA
2. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, GA 30303, USA
3. Division of Infectious Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, GA 30303, USA
4. Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30303, USA
5. Clinical Laboratory, Grady Memorial Hospital, Atlanta, GA 30303, USA