Daniel N Ricotta1,2,3, Grace C Huang1,2,3, Andrew J Hale4,5, Jason A Freed2,3, C Christopher Smith2,3. 1. Carl J Shapiro Institute for Education and Research, Boston, Massachusetts, USA. 2. Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA. 3. Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA. 4. Division of Infectious Disease, University of Vermont Medical Center, Burlington, Vermont, USA. 5. Division of Infectious Disease, University of Vermont Larner College of Medicine, Burlington, Vermont, USA.