1. Department of Internal Medicine Vanderbilt University Medical Center Nashville Tennessee USA
2. Department of Internal Medicine Massachusetts General Hospital Boston Massachusetts USA
3. Department of Medicine, Division of Allergy and Clinical Immunology Johns Hopkins University School of Medicine Baltimore Maryland USA
4. Pathology, Microbiology and Immunology Vanderbilt University Medical Center Nashville Tennessee USA
5. Tennessee Valley Healthcare System United States Department of Veterans Affairs Nashville Tennessee USA
6. Biomedical Informatics Vanderbilt University Medical Center Nashville Tennessee USA