1 Division of Infectious Diseases and Silverman Institute for Health Care Quality and Safety, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts.
2 Division of Infectious Diseases, University of North Carolina School of Medicine, Chapel Hill, North Carolina.
3 Program on Regulation, Therapeutics, and Law (PORTAL), Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts.