The authors reply

Affiliations

• ¹ Critical Care Medicine Department, National Institutes of Health Clinical Center, Bethesda, MD.
• ² Division of Infectious Diseases, Department of Medicine, McGill University Health Centre, Montreal, QC, Canada.
• ³ Georgetown University School of Medicine, Washington, DC.
• ⁴ Department of Medicine, Medstar Georgetown University Hospital, Washington, DC.
• ⁵ Department of Biostatistics and Bioinformatics, George Washington University, Washington, DC.
• ⁶ Department of Medicine, Division of Infectious Diseases, Emory University School of Medicine, Atlanta, GA.
• ⁷ Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA.
• ⁸ Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA.
• ⁹ Division of Infectious Diseases, Brigham and Women's Hospital, Boston, MA.