1. The University of Texas Health Science Center at Houston, McGovern Medical School, UT Health, Houston, TX, USA
2. Division of Hematology/Oncology, Department of Medicine, University of California San Francisco, San Francisco, CA, USA
3. Division of Infectious Diseases, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
4. Department of Medicine, Corporal Michael J. Crescenz VA Medical Center, Philadelphia, PA, USA
5. Division of Geriatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
6. Division of Employee Occupational Health, Corporal Michael J. Crescenz VA Medical Center, Philadelphia, PA, USA