About the Authors
Department of Pathology, Case Western Reserve University, Cleveland, Ohio, United States of America
Department of Medical Microbiology and Immunology, Creighton University, Omaha, Nebraska, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: NS. Performed the experiments: AS AOI XL MLM. Analyzed the data: AS AOI MLc NS. Contributed reagents/materials/analysis tools: FC QK JB. Wrote the paper: NS. Proof-read and edited the paper: AS. Wrote part of the paper: AS.