1. Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA.
2. Center for Systems Immunology, University of Pittsburgh, Pittsburgh, PA 15261, USA.
3. Department of Infectious Diseases and Microbiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA 15261, USA.
4. Department Computational and Systems Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA.