1. Section of Infectious Diseases, Department of Medicine, VA Boston Healthcare System, Boston, Massachusetts, USA
2. Center for Healthcare Organization and Implementation Research (CHOIR), VA Boston Healthcare System, Boston, Massachusetts, USA
3. Harvard Medical School, Boston, Massachusetts, USA
4. Division of Infectious Diseases, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
5. Department of Surgery, Boston University School of Medicine, Boston, Massachusetts, USA