1 Division of Infectious Diseases, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, USA Daniel.Escobar@pennmedicine.upenn.edu.
2 Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
3 Division of Infectious Diseases, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, USA.
4 Healthcare Epidemiology, Infection Prevention and Control, Hospital of the University of Pennsylvania, Philadelphia, PA, USA.