1. Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
2. Microbial Genomic Epidemiology Laboratory, Center for Genomic Epidemiology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
3. Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pennsylvania, USA
4. Center for Evolutionary Biology and Medicine, University of Pittsburgh School of Medicine, Pennsylvania, USA