1 Division of Infectious Diseases, Department of Medicine, Allegheny General Hospital, Allegheny Health Network, Pittsburgh, Pa. Electronic address: Thomas.Walsh@ahn.org.
2 Division of Infectious Diseases, Department of Medicine, Allegheny General Hospital, Allegheny Health Network, Pittsburgh, Pa.
3 Department of Pathology, Allegheny General Hospital, Allegheny Health Network, Pittsburgh, Pa.