1. Division of Infectious Diseases, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts
2. Division of Infectious Diseases, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts
3. Harvard Medical School, Boston, Massachusetts
4. Department of Surgery, Massachusetts General Hospital, Boston, Massachusetts
5. Regional Emerging Special Pathogens Treatment Center, Massachusetts General Hospital, Boston, Massachusetts
6. Infection Control Unit, Massachusetts General Hospital, Boston, Massachusetts
7. Department of Pathology, Massachusetts General Hospital, Boston, Massachusetts