1. Department of Pediatrics, University of Pittsburgh School of Medicine , Pittsburgh, Pennsylvania, USA
2. University of Pittsburgh, Graduate Program in Microbiology and Immunology , Pittsburgh, Pennsylvania, USA
3. The Ellis School , Pittsburgh, Pennsylvania, USA
4. Department of Pediatrics, New York University , New York, New York, USA
5. Department of Microbiology, New York University , New York, New York, USA
6. Department of Microbiology and Immunology, Institute for Genome Sciences, University of Maryland School of Medicine , Baltimore, Maryland, USA
7. Richard King Mellon Institute for Pediatric Research, University of Pittsburgh Medical School , Pittsburgh, Pennsylvania, USA
8. UPMC Children’s Hospital of Pittsburgh , Pittsburgh, Pennsylvania, USA